Keynes was the fourth son of Geoffrey Keynes and his wife Margaret Darwin, daughter of Sir George Darwin; he was also a nephew of the economist John Maynard Keynes. His brothers were Richard, Quentin and Milo. In 1955 he married Mary Cecilia Knatchbull-Hugessen, daughter of the Canadian senator Adrian Knatchbull-Hugessen. They have the following children:
- Gregory Robert Edward Keynes (born 3 June 1956)
- Elizabeth Harriet Keynes (born 15 December 1957)
- Toby William Keynes (born 2 November 1959)
- Martha Paganel Keynes (born 25 April 1961)
- Zachary Edmund Keynes (born 18 October 1962)
- "Trustees". Charles Darwin Trust. Retrieved 1 August 2013.
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