Question: Who is Kerry Kennedy related to that is the only child of President John F. Kennedy?

Context articles: Joseph P. Kennedy Sr.
Once Upon a Secret
Kerry Kennedy
Caroline Kennedy
Babushka Lady
Rush to Judgment
Warren Commission
King Kennedy
Jean Kennedy Smith
John F. Kennedy Eternal Flame

Joseph Patrick "Joe" Kennedy Sr. (September 6, 1888 – November 18, 1969) was an American businessman, investor, and politician known for his high-profile positions in United States politics.
 Kennedy was married to Rose Kennedy.
 Three of their nine children attained distinguished political positions: President John F. Kennedy (1917–1963), Attorney General and Senator Robert F. Kennedy (1925–1968), and longtime Senator Edward M. "Ted" Kennedy (1932–2009).
 He was a leading member of the Democratic Party and of the Irish Catholic community.
 He was appointed by President Franklin D. Roosevelt to be the first chairman of the U.S. Securities and Exchange Commission (SEC), and later directed the Maritime Commission.
 Kennedy served as the United States Ambassador to the United Kingdom from 1938 until late 1940, when he annoyed Roosevelt by his pessimism about Britain's survival.
Once Upon a Secret: My Affair with President John F. Kennedy and Its Aftermath is a book by the former White House intern Mimi Alford in February 2012.
 It contains the autobiographical account of the woman who had an affair with U.S. President John F. Kennedy towards the end of his life (from June 1962 to July 1963).
 Despite its consuming influence over her life at the time, Alford managed to keep her involvement in the affair secret for nearly 50 years, until basic details were published in the 2003 Kennedy biography "" by Robert Dallek.
Mary Kerry Kennedy (born September 8, 1959) is an American human rights activist and writer.
 She is the seventh child and third daughter of Robert F. Kennedy and Ethel Skakel Kennedy.
 After her 15-year marriage to now-New York Governor Andrew Cuomo, she was known as Kerry Kennedy Cuomo from 1991 until 2003.
 She is the president of Robert F. Kennedy Human Rights.
 She is also a niece of the late President John F. Kennedy and United States Senator Ted Kennedy, and a cousin of former U.S. Ambassador to Japan Caroline Kennedy and Maria Shriver, the estranged wife of actor, bodybuilder, and former California Governor Arnold Schwarzenegger.
Caroline Bouvier Kennedy (born November 27, 1957) is an American author, attorney, and diplomat who served as the United States Ambassador to Japan from 2013 to 2017.
 She is a prominent member of the Kennedy family and the only surviving child of President John F. Kennedy and First Lady Jacqueline Onassis.
The Babushka Lady is an unknown woman present during the 1963 assassination of President John F. Kennedy who might have photographed the events that occurred in Dallas' Dealey Plaza at the time President John F. Kennedy was shot.
 Her nickname arose from the headscarf she wore, which was similar to scarves worn by elderly Russian women (бабушка – "babushka" – literally means "grandmother" or "old woman" in Russian).
Rush to Judgment: A Critique of the Warren Commission's Inquiry into the Murders of President John F. Kennedy, Officer J.D. Tippit and Lee Harvey Oswald is a 1966 book by American lawyer Mark Lane.
 It is about the assassination of U.S. President John F. Kennedy and takes issue with the investigatory methods and conclusions of the Warren Commission.
 The book's introduction is by Hugh Trevor-Roper, Regius Professor of History at the University of Oxford.
 Although it was preceded by a few self-published or small press books, "Rush to Judgment" was the first mass-marketed hardcover book to confront the findings of the Warren Commission.
The President's Commission on the Assassination of President Kennedy, known unofficially as the Warren Commission, was established by President Lyndon B. Johnson through Executive Order on November 29, 1963 to investigate the assassination of United States President John F. Kennedy that had taken place on November 22, 1963.
 The U.S. Congress passed Senate Joint Resolution 137 authorizing the Presidential appointed Commission to report on the assassination of President John F. Kennedy, mandating the attendance and testimony of witnesses and the production of evidence.
 Its 888-page final report was presented to President Johnson on September 24, 1964 and made public three days later.
 It concluded that President Kennedy was assassinated by Lee Harvey Oswald and that Oswald acted entirely alone.
 It also concluded that Jack Ruby also acted alone when he killed Oswald two days later.
 The Commission's findings have proven controversial and have been both challenged and supported by later studies.
King Kennedy is an upcoming drama thriller film set in the 1960s made entirely from archive material.
 The film stars some of the most prominent characters from 1960s America, including US President John F. Kennedy, Robert F. Kennedy, the civil rights movement leader Martin Luther King, convicted assassins Lee Harvey Oswald and Sirhan Sirhan and the film world's brightest icons of that time Marilyn Monroe and Frank Sinatra.
 The plot line revolves around the concepts of truth and freedom, but pursues further towards deception, intrigue, conspiracy and murder, and features some of the most memorable moments in 1960s America, including Marilyn Monroe's world-famous "Happy Birthday, Mr. President" at Madison Square Garden and Martin Luther King's "I Have A Dream" speech on the steps of the Lincoln Memorial in which he called for racial equality and an end to discrimination.
 The film is designed primarily to remind, focusing on the characters and events that build up to the assassinations of John F. Kennedy, Robert F. Kennedy and Martin Luther King as their apparent determination to shy away from war, discrimination and hatred became ever more publicized.
Jean Ann Kennedy Smith (born February 20, 1928) is an American diplomat who served as United States Ambassador to Ireland from 1993 to 1998.
 She is the eighth of nine children born to Joseph P. Kennedy, Sr. and Rose Fitzgerald, and is their longest-lived and last surviving child.
 Her siblings include President John F. Kennedy, Senator Robert F. Kennedy, longtime Senator Ted Kennedy, and Special Olympics founder Eunice Kennedy Shriver.
The John F. Kennedy Eternal Flame is a presidential memorial at the gravesite of U.S. President John F. Kennedy, in Arlington National Cemetery.
 The permanent site replaced a temporary grave and eternal flame used during President Kennedy's funeral on November 25, 1963.
 The site was designed by architect John Carl Warnecke, a long-time friend of the President.
 The permanent John F. Kennedy Eternal Flame grave site was consecrated and opened to the public on March 15, 1967.