user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: Which of JFK's brothers died on 06-06-1968? 
Knowledge Triplets: John F. Kennedy, base.crime.crime_victim.crime_type, Assassination
Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested., base.kwebbase.kwsentence.previous_sentence, On November 22, 1963, Kennedy was assassinated as he and his wife drove through Dallas, Texas.
John F. Kennedy, film.film_subject.films, JFK
JFK wants to know, book.book.editions, JFK wants to know: memos from the President's office, 1961-1963
John F. Kennedy, book.book_subject.works, An Unfinished Life: John F. Kennedy, 1917–1963
An Unfinished Life: John F. Kennedy, 1917–1963, book.written_work.subjects, History of the United States
Kennedy was given a state funeral, attended by the leaders of more than 90 nations., base.kwebbase.kwsentence.kwtopic, John F. Kennedy
The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up, book.written_work.subjects, Late 20th Century
John F. Kennedy, people.person.education, m.0s94pc9
John F. Kennedy, common.topic.article, m.0230ccb
Lee Harvey Oswald, base.kwebbase.kwtopic.connections_to, john fitzgerald kennedy allegedly assassinated by lee harvey oswald
m.03hs9fc, people.sibling_relationship.sibling, Robert F. Kennedy
Kennedy family, people.family.members, Ted Kennedy
Thirteen Days, film.film_subject.films, Robert F. Kennedy
m.03hs9fc, people.sibling_relationship.sibling, John F. Kennedy
m.02_wjwf, people.sibling_relationship.sibling, John F. Kennedy
Kennedy was given a state funeral, attended by the leaders of more than 90 nations., base.kwebbase.kwsentence.next_sentence, He is buried in Arlington National Cemetery in a grave marked with an eternal flame.
Joseph P. Kennedy, Sr., freebase.valuenotation.is_reviewed, Place of death
Robert F. Kennedy, people.family_member.family, Kennedy family
JFK and LBJ, book.written_work.subjects, United States of America
John F. Kennedy, people.person.education, m.04yzw40
Brookline, people.person.place_of_birth, Robert F. Kennedy
Forty ways to look at JFK, book.written_work.subjects, History of the United States
JFK in Ireland, book.written_work.subjects, John F. Kennedy
Frame 313: The JFK Assassination Theories, film.film.personal_appearances, m.0yl7g7g
John F. Kennedy, people.person.profession, Politician
John F. Kennedy, people.person.education, m.0125n7tg
Robert F. Kennedy, people.person.parents, Joseph P. Kennedy, Sr.
The JFK assassination, book.written_work.subjects, Assassination of John F. Kennedy
John F. Kennedy, base.kwebbase.kwtopic.has_sentences, The circumstances of Kennedy's death led to a multitude of theories about who was responsible for his death.
m.05hr29y, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, people.person.education, m.04kr2n0
m.05hr30q, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Parents, freebase.valuenotation.is_reviewed, Robert F. Kennedy
John F. Kennedy Jr., people.person.profession, Writer
JFK wants to know, book.written_work.author, John F. Kennedy
John F. Kennedy, people.person.education, m.0s94p54
Assassination of John F. Kennedy, book.book_subject.works, Live by the sword
Joseph P. Kennedy, Jr., people.person.nationality, United States of America
John F. Kennedy, people.person.education, m.0125d08t
John F. Kennedy, people.person.education, m.04t5mdc
John F. Kennedy, book.author.works_written, The uncommon wisdom of JFK
Politician, people.person.profession, Robert F. Kennedy
He is buried in Arlington National Cemetery in a grave marked with an eternal flame., base.kwebbase.kwsentence.kwtopic, John F. Kennedy
m.05hr152, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Ted Kennedy, people.person.sibling_s, m.02_wjwf
Forty ways to look at JFK, book.written_work.subjects, John F. Kennedy
John F. Kennedy, book.book_subject.works, Forty ways to look at JFK
Kennedy family, people.family.members, Eunice Kennedy Shriver
m.05hr28t, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Date of birth, freebase.valuenotation.is_reviewed, Robert F. Kennedy
Joseph P. Kennedy, Jr., people.person.religion, Catholicism
Robert F. Kennedy, freebase.valuenotation.is_reviewed, Date of death
On November 22, 1963, Kennedy was assassinated as he and his wife drove through Dallas, Texas., base.kwebbase.kwsentence.next_sentence, Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested.
John F. Kennedy, people.person.sibling_s, m.03hs9fc
lee harvey oswald allegedly assassinated john fitzgerald kennedy, base.kwebbase.kwconnection.other, John F. Kennedy
m.03lfq4h, people.sibling_relationship.sibling, John F. Kennedy
John F. Kennedy, common.topic.image, JFK portrait
John F. Kennedy, freebase.valuenotation.is_reviewed, Gender
John F. Kennedy, common.topic.webpage, m.09y460p
John F. Kennedy, book.book_subject.works, JFK and LBJ
John F. Kennedy, people.person.children, Caroline Kennedy
m.05hqw12, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
JFK and LBJ, common.topic.notable_for, g.125920hxx
Joseph P. Kennedy, Sr., people.person.children, Robert F. Kennedy
On November 22, 1963, Kennedy was assassinated as he and his wife drove through Dallas, Texas., base.kwebbase.kwsentence.kwtopic, John F. Kennedy
Country of nationality, freebase.valuenotation.is_reviewed, Robert F. Kennedy
John F. Kennedy, people.person.place_of_birth, Brookline
The JFK assassination, common.topic.notable_for, g.125dzdm73
John F. Kennedy, people.person.children, John F. Kennedy Jr.
Kennedy was given a state funeral, attended by the leaders of more than 90 nations., base.kwebbase.kwsentence.previous_sentence, None of the theories has been proved.
Robert F. Kennedy, freebase.valuenotation.is_reviewed, Place of death
The faith of JFK, book.written_work.author, John F. Kennedy
John F. Kennedy, freebase.valuenotation.is_reviewed, Children
m.0yl7g7g, film.personal_film_appearance.film, Frame 313: The JFK Assassination Theories
The humor of JFK, book.book.editions, The humor of JFK
Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested., base.kwebbase.kwsentence.kwtopic, John F. Kennedy
Joseph P. Kennedy, Sr., people.person.children, Kathleen Cavendish
United States of America, people.person.nationality, Robert F. Kennedy
m.07ydm_5, people.sibling_relationship.sibling, Patrick Bouvier Kennedy
John F. Kennedy, common.topic.webpage, m.0b48xzc
Forty ways to look at JFK, book.written_work.subjects, Late 20th Century
The JFK assassination, common.topic.notable_types, Book
John F. Kennedy, base.kwebbase.kwtopic.connections_to, lee harvey oswald allegedly assassinated john fitzgerald kennedy
John F. Kennedy, media_common.dedicatee.dedications, m.04szj3z
John F. Kennedy, people.person.sibling_s, m.02_wjwf
John F. Kennedy, people.person.places_lived, m.046ffp7
m.05hr2pb, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Joseph P. Kennedy, Sr., people.person.children, Joseph P. Kennedy, Jr.
John F. Kennedy, people.person.sibling_s, m.03lfptc
John F. Kennedy, people.person.sibling_s, m.03lfpt2
Ted Kennedy, people.deceased_person.place_of_burial, Arlington National Cemetery
Assassination of John F. Kennedy, book.book_subject.works, The JFK assassination
Patrick Bouvier Kennedy, people.deceased_person.cause_of_death, Infant respiratory distress syndrome
Assassination of John F. Kennedy, film.film_subject.films, JFK
m.05hr1wg, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
JFK: BREAKING THE NEWS, film.film.language, English Language
Robert F. Kennedy, base.crime.crime_victim.crime_type, Assassination
m.05hr33z, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, book.book_subject.works, The JFK assassination
World War II, military.military_person.participated_in_conflicts, Robert F. Kennedy
John F. Kennedy, people.person.places_lived, m.03pfbz7
John F. Kennedy, freebase.valuenotation.is_reviewed, Place of death
Assassination of John F. Kennedy, book.book_subject.works, The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up
m.07ydn0q, people.sibling_relationship.sibling, Patrick Bouvier Kennedy
John F. Kennedy Jr., people.person.sibling_s, m.07ydn0q
JFK: BREAKING THE NEWS, film.film.country, United States of America
Two days later, Oswald was shot and killed while in police custody by Jack Ruby, a nightclub owner., base.kwebbase.kwsentence.kwtopic, John F. Kennedy
John F. Kennedy, people.person.sibling_s, m.03lfq3_
John F. Kennedy, freebase.valuenotation.is_reviewed, Date of death
John F. Kennedy, common.topic.webpage, m.09x5n2n
JFK in Ireland, common.topic.notable_for, g.1258hxpfs
Two days later, Oswald was shot and killed while in police custody by Jack Ruby, a nightclub owner., base.kwebbase.kwsentence.previous_sentence, Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested.
Joseph P. Kennedy, Sr., people.person.children, Eunice Kennedy Shriver
Assassination of John F. Kennedy, film.film_subject.films, Films from the Sixth Floor
m.05hr2r9, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Robert F. Kennedy, people.person.sibling_s, m.03hs9fc
Joseph P. Kennedy, Jr., people.person.place_of_birth, Brookline
JFK, film.film.language, English Language
John F. Kennedy, people.deceased_person.cause_of_death, Assassination
Patrick Bouvier Kennedy, people.person.sibling_s, m.07ydm_5
John F. Kennedy Eternal Flame, common.topic.image, JFK grave
Joseph P. Kennedy, Sr., people.family_member.family, Kennedy family
JFK and LBJ, book.written_work.subjects, Late 20th Century
None of the theories has been proved., base.kwebbase.kwsentence.previous_sentence, The circumstances of Kennedy's death led to a multitude of theories about who was responsible for his death.
m.03hs9fc, people.sibling_relationship.sibling, Robert F. Kennedy
John F. Kennedy Jr., people.person.profession, Businessperson
Patrick Bouvier Kennedy, people.deceased_person.place_of_burial, Arlington National Cemetery
JFK in Ireland, common.topic.article, m.0fphb9v
John F. Kennedy, book.author.works_written, JFK wants to know
Arlington National Cemetery, people.deceased_person.place_of_burial, Robert F. Kennedy
John F. Kennedy, freebase.valuenotation.is_reviewed, Date of birth
John F. Kennedy, people.person.nationality, United States of America
m.03lfptc, people.sibling_relationship.sibling, John F. Kennedy
JFK and LBJ, common.topic.notable_types, Book
John F. Kennedy, people.person.children, Patrick Bouvier Kennedy
JFK, film.film.country, United States of America
John F. Kennedy, people.person.gender, Male
Joseph P. Kennedy, Sr., freebase.valuenotation.is_reviewed, Date of birth
John F. Kennedy, people.person.parents, Joseph P. Kennedy, Sr.
On November 22, 1963, Kennedy was assassinated as he and his wife drove through Dallas, Texas., base.kwebbase.kwsentence.dates, m.0c0zkjd
John F. Kennedy, base.kwebbase.kwtopic.has_sentences, On November 22, 1963, Kennedy was assassinated as he and his wife drove through Dallas, Texas.
m.05hr1z3, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
“American Adulterer” Author Jed Mercurio on JFK’s Personal Life, Sexual Affairs, common.resource.annotations, m.0b48xzc
John F. Kennedy Jr., people.person.gender, Male
The humor of JFK, common.topic.notable_for, g.125cjy15q
John F. Kennedy, government.political_appointer.appointees, m.03hs9g8
JFK wants to know, freebase.valuenotation.is_reviewed, Date of first publication
m.03lfpt2, people.sibling_relationship.sibling, John F. Kennedy
John F. Kennedy, base.crime.crime_victim.crime_type, Assassination
John F. Kennedy, people.person.education, m.03lll60
Gender, freebase.valuenotation.is_reviewed, Robert F. Kennedy
Assassination of John F. Kennedy, base.newsevents.videotaped_event.footage, Zapruder film
John F. Kennedy, people.person.sibling_s, m.03lfqsd
Robert F. Kennedy, people.deceased_person.place_of_burial, Arlington National Cemetery
john fitzgerald kennedy allegedly assassinated by lee harvey oswald, base.kwebbase.kwconnection.subject, John F. Kennedy
Date of death, freebase.valuenotation.is_reviewed, Robert F. Kennedy
John F. Kennedy, people.family_member.family, Kennedy family
John F. Kennedy, people.person.profession, Screenwriter
John F. Kennedy, base.kwebbase.kwtopic.has_sentences, Two days later, Oswald was shot and killed while in police custody by Jack Ruby, a nightclub owner.
An Unfinished Life: John F. Kennedy, 1917–1963, book.book.genre, Biography
John F. Kennedy, freebase.valuenotation.is_reviewed, Place of death
JFK portrait, common.image.size, m.0kl96j
John F. Kennedy Jr., base.famouspets.pet_owner.pets_owned, m.05hr370
JFK and LBJ, book.written_work.author, Tom Wicker
John F. Kennedy Jr., people.person.sibling_s, m.0pbycd1
m.05hr2jj, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, people.family.members, Kennedy family
m.05hr32p, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Joseph P. Kennedy, Sr., people.person.children, Patricia Kennedy Lawford
Place of death, freebase.valuenotation.is_reviewed, Robert F. Kennedy
John F. Kennedy, people.person.education, m.0s94p0_
Jacqueline Kennedy Onassis, people.person.children, John F. Kennedy Jr.
John F. Kennedy, book.book_subject.works, The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up
Place of birth, freebase.valuenotation.is_reviewed, Robert F. Kennedy
The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up, common.topic.notable_types, Book
Robert F. Kennedy, people.person.parents, Rose Kennedy
John F. Kennedy, people.person.education, m.0125s3s2
John F. Kennedy, people.person.education, m.035j_7r
JFK, film.film.subjects, John F. Kennedy
The wisdom of JFK, common.topic.notable_for, g.12582gg48
Ted Kennedy, people.person.parents, Joseph P. Kennedy, Sr.
JFK and LBJ, book.written_work.subjects, John F. Kennedy
The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up, book.written_work.subjects, John F. Kennedy
John F. Kennedy, freebase.valuenotation.is_reviewed, Place of birth
Forty ways to look at JFK, common.topic.notable_types, Book
John F. Kennedy, people.person.gender, Male
The JFK assassination, book.written_work.author, Carl Oglesby
John F. Kennedy, people.person.sibling_s, m.03lfq4h
Joseph P. Kennedy, Jr., people.person.parents, Rose Kennedy
The wisdom of JFK, book.written_work.author, John F. Kennedy
lee harvey oswald allegedly assassinated john fitzgerald kennedy, base.kwebbase.kwconnection.relation, allegedly assassinated
Joseph P. Kennedy, Sr., people.person.children, Rosemary Kennedy
m.0wrtwf8, film.personal_film_appearance.film, JFK Remembered: 50 Years Later
John F. Kennedy, base.kwebbase.kwtopic.connections_from, john fitzgerald kennedy allegedly assassinated by lee harvey oswald
m.03lfpfx, people.sibling_relationship.sibling, John F. Kennedy
John F. Kennedy, people.person.parents, Joseph P. Kennedy, Sr.
John F. Kennedy, book.book_subject.works, JFK in Ireland
The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up, book.written_work.subjects, History of the United States
m.05hr2tr, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, freebase.valuenotation.is_reviewed, Parents
John F. Kennedy, people.person.education, m.0n0y0g0
Joseph P. Kennedy, Sr., people.person.children, Jean Kennedy Smith
Lee Harvey Oswald, base.kwebbase.kwtopic.connections_from, lee harvey oswald allegedly assassinated john fitzgerald kennedy
John F. Kennedy, common.topic.webpage, m.09y6s4p
The JFK assassination, book.written_work.subjects, Late 20th Century
The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up, book.written_work.subjects, United States of America
Forty ways to look at JFK, common.topic.notable_for, g.125d1w6md
Assassination of John F. Kennedy, book.book_subject.works, The Kennedy Assassination Tapes
m.05hr2g2, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, people.person.children, Arabella Kennedy
Kennedy family, people.family.members, Robert F. Kennedy
John F. Kennedy, people.deceased_person.place_of_burial, Arlington National Cemetery
John F. Kennedy, people.person.education, m.0127vzjh
John F. Kennedy Jr., people.person.parents, John F. Kennedy
John F. Kennedy, freebase.valuenotation.is_reviewed, Date of birth
JFK Remembered: 50 Years Later, film.film.language, English Language
john fitzgerald kennedy allegedly assassinated by lee harvey oswald, base.kwebbase.kwconnection.sentence, Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested.
John F. Kennedy, base.kwebbase.kwtopic.has_sentences, Kennedy was given a state funeral, attended by the leaders of more than 90 nations.
JFK Remembered: 50 Years Later, film.film.personal_appearances, m.0wrtwf8
Carl Oglesby, book.author.works_written, The JFK assassination
Male, people.person.gender, Robert F. Kennedy
Assassination of John F. Kennedy, common.topic.notable_types, Event
John F. Kennedy, symbols.name_source.namesakes, Assassination of John F. Kennedy
The JFK assassination, book.written_work.subjects, John F. Kennedy
John F. Kennedy, military.military_person.participated_in_conflicts, World War II
m.03lfq3_, people.sibling_relationship.sibling, John F. Kennedy
Joseph P. Kennedy, Jr., people.person.parents, Joseph P. Kennedy, Sr.
Assassination of John F. Kennedy, base.culturalevent.event.entity_involved, Lee Harvey Oswald
John F. Kennedy, common.topic.webpage, m.0b46sw8
An Unfinished Life: John F. Kennedy, 1917–1963, book.written_work.subjects, Late 20th Century
lee harvey oswald allegedly assassinated john fitzgerald kennedy, base.kwebbase.kwconnection.subject, Lee Harvey Oswald
JFK wants to know, common.topic.notable_for, g.1254_81q8
Joseph P. Kennedy, Sr., people.person.children, Ted Kennedy
John F. Kennedy, people.person.profession, Writer
Kennedy family, people.family.members, Joseph P. Kennedy, Jr.
John F. Kennedy, people.person.religion, Catholicism
The wisdom of JFK, common.topic.notable_types, Book
Kennedy family, people.family.members, Joseph P. Kennedy, Sr.
m.0pbycd1, people.sibling_relationship.sibling, John F. Kennedy Jr.
Assassination of John F. Kennedy, common.topic.subject_of, Text and Meaning in Robert Frost's \"Dedication: For John F. Kennedy\"
m.05hr35p, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, people.sibling_relationship.sibling, m.03hs9fc
John F. Kennedy, people.person.education, m.0125jfhh
John F. Kennedy, freebase.valuenotation.is_reviewed, Parents
John F. Kennedy, base.kwebbase.kwtopic.has_sentences, Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested.
Patrick Bouvier Kennedy, people.deceased_person.place_of_death, Boston Children's Hospital
Joseph P. Kennedy, Sr., people.person.children, John F. Kennedy
John F. Kennedy, base.activism.activist.area_of_activism, Anti-communism
Kennedy family, people.family.members, Kathleen Cavendish
Assassination, people.deceased_person.cause_of_death, Robert F. Kennedy
Writer, people.person.profession, Robert F. Kennedy
The faith of JFK, common.topic.notable_for, g.1259536by
Lee Harvey Oswald, a young ex-Marine with links to the Soviet Union, was arrested., base.kwebbase.kwsentence.contains_connections, john fitzgerald kennedy allegedly assassinated by lee harvey oswald
JFK Remembered: 50 Years Later, film.film.country, United States of America
Patrick Bouvier Kennedy, people.person.sibling_s, m.0pbycd7
Assassination of John F. Kennedy, time.event.locations, Dallas
The uncommon wisdom of JFK, book.written_work.author, John F. Kennedy
John F. Kennedy, people.deceased_person.place_of_burial, Arlington National Cemetery
Catholicism, people.person.religion, Robert F. Kennedy
The JFK assassination, book.written_work.subjects, United States of America
[JFK], music.recording.contributions, g.11c3k32nkf
Assassination of John F. Kennedy, base.crime.crime.victim_s, John F. Kennedy
m.05hqw7y, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, book.author.works_written, The humor of JFK
Jean Kennedy Smith, people.person.parents, Joseph P. Kennedy, Sr.
Kennedy family, people.family.members, Robert F. Kennedy
[JFK], music.recording.contributions, m.013dzn4r
Assassination of John F. Kennedy, symbols.namesake.named_after, John F. Kennedy
john fitzgerald kennedy allegedly assassinated by lee harvey oswald, base.kwebbase.kwconnection.relation, allegedly assassinated by
The JFK assassination, book.written_work.subjects, History of the United States
John F. Kennedy Jr., people.family_member.family, Kennedy family
An Unfinished Life: John F. Kennedy, 1917–1963, book.written_work.subjects, United States of America
JFK portrait, common.image.appears_in_topic_gallery, John F. Kennedy
John F. Kennedy, book.book_subject.works, The Kennedy Assassination Tapes
The circumstances of Kennedy's death led to a multitude of theories about who was responsible for his death., base.kwebbase.kwsentence.kwtopic, John F. Kennedy
John F. Kennedy Jr., people.person.religion, Catholicism
John F. Kennedy, common.topic.webpage, m.0b48tfl
The humor of JFK, book.written_work.author, John F. Kennedy
Joseph P. Kennedy, Jr., people.person.sibling_s, m.03lfptc
Kennedy family, people.person.nationality, United States of America
Kennedy family, people.family.members, Patrick Bouvier Kennedy
m.05hr370, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Assassination of John F. Kennedy, film.film_subject.films, Zapruder film
Robert F. Kennedy, people.deceased_person.cause_of_death, Assassination
Patrick Bouvier Kennedy, people.person.parents, John F. Kennedy
Kennedy family, people.family.members, John F. Kennedy
m.07ydn0q, people.sibling_relationship.sibling, John F. Kennedy Jr.
Joseph P. Kennedy, Sr., people.person.children, Robert F. Kennedy
John F. Kennedy, people.person.spouse_s, m.02h_bpj
Ted Kennedy, people.deceased_person.cause_of_death, Cancer
The circumstances of Kennedy's death led to a multitude of theories about who was responsible for his death., base.kwebbase.kwsentence.next_sentence, None of the theories has been proved.
JFK: BREAKING THE NEWS, film.film.personal_appearances, m.0_t8tdg
Forty ways to look at JFK, book.written_work.subjects, United States of America
John F. Kennedy Jr., people.person.place_of_birth, Washington, D.C.
John F. Kennedy, film.film.subjects, Thirteen Days
Patrick Bouvier Kennedy, people.person.sibling_s, m.07ydn0q
John F. Kennedy Jr., freebase.valuenotation.has_no_value, Children
John F. Kennedy, base.crime.crime_victim.crime, Assassination of John F. Kennedy
Anti-communism, base.activism.activist.area_of_activism, Robert F. Kennedy
m.05hr2fd, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, freebase.valuenotation.is_reviewed, Cause of death
Kathleen Cavendish, people.person.parents, Joseph P. Kennedy, Sr.
Rich Little, base.americancomedy.impersonated_celebrity.impersonated_by, Robert F. Kennedy
John F. Kennedy, freebase.valuenotation.is_reviewed, Country of nationality
John F. Kennedy, freebase.valuenotation.is_reviewed, Date of death
John F. Kennedy Jr., people.person.parents, Jacqueline Kennedy Onassis
Joseph P. Kennedy, Jr., people.person.gender, Male
John F. Kennedy, people.person.sibling_s, m.03lfpfx
Joseph P. Kennedy, Sr., people.deceased_person.cause_of_death, Stroke
JFK, film.film.subjects, Assassination of John F. Kennedy
m.05hr220, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
Two days later, Oswald was shot and killed while in police custody by Jack Ruby, a nightclub owner., base.kwebbase.kwsentence.next_sentence, The circumstances of Kennedy's death led to a multitude of theories about who was responsible for his death.
Kennedy family, people.family.members, Jean Kennedy Smith
m.03lfptc, people.sibling_relationship.sibling, Joseph P. Kennedy, Jr.
m.0pbycd7, people.sibling_relationship.sibling, Patrick Bouvier Kennedy
JFK and LBJ, book.written_work.subjects, History of the United States
john fitzgerald kennedy allegedly assassinated by lee harvey oswald, base.kwebbase.kwconnection.other, Lee Harvey Oswald
John F. Kennedy, people.deceased_person.cause_of_death, Gunshot
Joseph P. Kennedy, Jr., people.family_member.family, Kennedy family
m.03lfqsd, people.sibling_relationship.sibling, John F. Kennedy
John F. Kennedy, base.americancomedy.impersonated_celebrity.impersonated_by, Rich Little
m.03hs9g8, government.politician.government_positions_held, Robert F. Kennedy
An Unfinished Life: John F. Kennedy, 1917–1963, common.topic.notable_types, Book
Kennedy family, people.family.country, United States of America
John F. Kennedy, media_common.dedicatee.dedications, m.04tm7xj
m.0b48xzc, common.webpage.resource, “American Adulterer” Author Jed Mercurio on JFK’s Personal Life, Sexual Affairs
John F. Kennedy, people.person.education, m.0125tzqv
John F. Kennedy 1961 presidential inauguration, common.topic.image, Jfk inauguration
John F. Kennedy, people.person.education, m.0123x2k3
Gretchen Rubin, book.author.works_written, Forty ways to look at JFK
Assassination of John F. Kennedy, base.culturalevent.event.entity_involved, John F. Kennedy
Rose Kennedy, people.person.children, Robert F. Kennedy
John F. Kennedy, people.person.parents, Rose Kennedy
m.05hr38w, base.famouspets.pet_ownership.owner, John F. Kennedy Jr.
John F. Kennedy, book.author.works_written, The wisdom of JFK
John F. Kennedy, people.person.parents, Rose Kennedy
John F. Kennedy, people.deceased_person.place_of_death, Dallas
John F. Kennedy, common.topic.article, m.05bsz7m
The uncommon wisdom of JFK, common.topic.notable_for, g.125bwr5_m
Patrick Bouvier Kennedy, common.topic.image, Gravestone for Patrick Bouvier Kennedy in Arlington National Cemetery
The killing of a president : the complete photographic record of the JFK Assassination, the conspiracy and the cover-up, book.written_work.subjects, Assassination of John F. Kennedy
John F. Kennedy Jr., base.famouspets.pet_owner.pets_owned, m.05hr152
JFK in Ireland, book.written_work.author, Ryan Tubridy
Assassination of John F. Kennedy, book.book_subject.works, Four Days in November
Forty ways to look at JFK, book.written_work.author, Gretchen Rubin
John F. Kennedy Jr., people.person.nationality, United States of America
John F. Kennedy, people.person.education, m.0127txc2
John F. Kennedy, book.author.works_written, The faith of JFK
The circumstances of Kennedy's death led to a multitude of theories about who was responsible for his death., base.kwebbase.kwsentence.previous_sentence, Two days later, Oswald was shot and killed while in police custody by Jack Ruby, a nightclub owner.
Joseph P. Kennedy, Sr., freebase.valuenotation.is_reviewed, Date of death
Kennedy family, people.family.members, John F. Kennedy Jr.

Answer: Robert F. Kennedy