Question: Nowhere Boy is a 2009 British biographical musical drama film, about John Lennon's adolescence, his relationships with his aunt Mimi Smith and his mother Julia Lennon, the creation of his first band, the Quarrymen, and its evolution into the Beatles, the film is based on a biography written by Lennon's half-sister, who is the younger half-sister of English musician John Lennon and is the eldest daughter of John 'Bobby' Albert Dykins?
Context: Ivan Vaughan (18 June 1942 – 16 August 1993) was a boyhood friend of John Lennon, and later schoolmate of Paul McCartney at the Liverpool Institute, both commencing school there in September 1953.  He was born on the same day as McCartney in Liverpool.  He played bass part-time in Lennon's first band, The Quarrymen, and was responsible for introducing Lennon to McCartney at a community event (the Woolton village fête) on 6 July 1957, where The Quarrymen were performing.  McCartney impressed Lennon, who invited McCartney to join the band, which he did a day later.  This led to the formation of Lennon and McCartney's songwriting partnership, and later of The Beatles. Julia Baird (née Dykins) (born 5 March 1947) is the younger half-sister of English musician John Lennon and is the eldest daughter of John 'Bobby' Albert Dykins (1918 – December 1965) and Julia Lennon (12 March 1914 – 15 July 1958).  She also has an older half-sister, Ingrid Pedersen.  Her younger sister is Jacqueline 'Jackie' Dykins (born 26 October 1949). The U.S. vs. John Lennon is a 2006 documentary film about English musician John Lennon's transformation from a member of The Beatles to a rallying anti-war activist striving for world peace during the late 1960s and early 1970s.  The film also details the attempts by the United States government under President Richard Nixon to silence him.  The film had its world premiere at the Venice Film Festival and its North American premiere at the Toronto International Film Festival.  It was released in New York City and Los Angeles, California on 15 September 2006, and had a nationwide release on 29 September.  A soundtrack composed of John Lennon tracks was released by Capitol Records and EMI on 26 September 2006. Julia Lennon (née Stanley; 12 March 1914 – 15 July 1958) was the mother of English musician John Lennon, who was born during her marriage to Alfred Lennon.  After complaints to Liverpool's Social Services by her eldest sister, Mimi Smith (née Stanley), she handed over the care of her son to her sister.  She later had one daughter after an affair with a Welsh soldier, but the baby was given up for adoption after pressure from her family.  She then had two daughters, Julia and Jackie, with John 'Bobby' Dykins.  She never divorced her husband, preferring to live as the common-law wife of Dykins for the rest of her life. The Quarrymen (also written as "the Quarry Men") are a British skiffle/rock and roll group, formed by John Lennon in Liverpool in 1956, which eventually evolved into the Beatles in 1960.  Originally consisting of Lennon and several schoolfriends, the Quarrymen took their name from a line in the school song of Quarry Bank High School, which they attended.  Lennon's mother, Julia Lennon, taught her son to play the banjo and then showed Lennon and Eric Griffiths how to tune their guitars in a similar way to the banjo, and taught them simple chords and songs. Cynthia Lennon (née Powell; 10 September 1939 – 1 April 2015) was the first wife of English musician John Lennon and mother of Julian Lennon.  She grew up in the middle-class section of Hoylake, on the Wirral Peninsula in North West England.  At the age of 12, she was accepted into the Junior Art School, and was later enrolled in the Liverpool College of Art.  John Lennon also attended the college; a meeting with Powell in a calligraphy class led to their relationship. "Julia" is a song by the Beatles, but performed as a solo work by John Lennon.  The song was written by Lennon (though credited to Lennon–McCartney) regarding his mother Julia Lennon, who died in 1958 at age 44. Nowhere Boy is a 2009 British biographical musical drama film about John Lennon's adolescence, his relationships with his aunt Mimi Smith and his mother Julia Lennon, the creation of his first band, the Quarrymen, and its evolution into the Beatles.  The film is based on a biography written by Lennon's half-sister Julia Baird.  The film received its US release on 8 October 2010, coinciding with that weekend's celebrations of the 70th anniversary of Lennon's birth (9 October 1940). "I'm the Greatest" is a song written by English musician John Lennon that was released as the opening track of the 1973 album "Ringo" by Ringo Starr.  With Starr, Lennon and George Harrison appearing on the track, it marks the only time that three former Beatles recorded together between the band's break-up in 1970 and Lennon's death in 1980.  Lennon wrote the song in December 1970 as a wry comment on his rise to fame, and later tailored the composition for Starr to sing.  Named after one of Muhammad Ali's catchphrases, the song partly evokes the stage-show concept of the Beatles' 1967 album "Sgt. Pepper's Lonely Hearts Club Band". The Killing of John Lennon is a 2006 British biographical drama film about Mark Chapman's plot to kill musician John Lennon.  The film was written and directed by Andrew Piddington, and stars Jonas Ball, Robert C. Kirk and Thomas A. McMahon.
Answer: Julia Baird