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?
Sentence (from "Nowhere Boy"): The film is based on a biography written by Lennon's half-sister Julia Baird.
Relevant evidence: Yes