She is Jewish on her mother's side, a descendant of 19th-century immigrants from Poland and Lithuanian Jews from what is now Latvia.
Her brothers are actor Sir Daniel, Nicholas and Sean Day-Lewis (who wrote a biography of their father).
[2] After attending Bedales School, she read English at King's College, Cambridge from 1973 until 1976.
[3] She writes for The Daily Telegraph, Vanity Fair, Vogue and Food Illustrated.
In October 2012, Day-Lewis and her brother Daniel donated papers belonging to their father to Oxford University, including early drafts of his work and letters from figures such as actor John Gielgud and poets W. H. Auden, Robert Graves and Philip Larkin.