Nowhere Boy is based on a biography partially written by which half-sister of John Lennon?
Nowhere Boy:  The film is based on a biography written by Lennon's half-sister Julia Baird. Julia Baird: 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).
Julia Baird