He married at St. Edward's, in Sutton Park, Guildford, Surrey, on 1 March 1967 Joan Douglas Dillon, daughter of U.S. Treasury Secretary C. Douglas Dillon and wife Phyllis Chess Ellsworth [REF].
Joan Dillon married firstly in Paris on 1 August 1953 James Brady Moseley (New York City, New York, 22 May 1931 - Boston, Suffolk County, Massachusetts, 9 April 1998), son of Boston investment banker Frederick S. Moseley, Jr. and wife Jane H. Brady.