He was the son of the golf writer Bernard Darwin and his wife the engraver Elinor Monsell. One of his sisters was the potter Ursula Mommens. He was a great-grandson of the naturalist Charles Darwin. In 1931 he married Yvonne Darby (1900?-1985) who was also an artist. After their divorce, he later married Ginette Hewitt (died 2006), who had been previously married to Lt-Col Kenneth Morton-Evans, OBE, TD and Bar, by whom she had two children, a son, Michael and a daughter, Angela.
‘DARWIN, Sir Robin (Robert Vere Darwin)’, Who Was Who, A & C Black, 1920–2008; online edn, Oxford University Press, Dec 2007 accessed 19 Jan 2012
R. Y. Goodden, ‘Darwin, Sir Robert Vere [Robin] (1910–1974)’, rev. Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, May 2006 accessed Sir Robert Vere Darwin (1910–1974): doi:10.1093/ref:odnb/31003