Douglas married Eileen Cecilia Ponsonby on 11 Dec 1919 in Holy Trinity, Brompton, Middlesex, England. Eileen (daughter of Louis George de Hale Ponsonby and Elizabeth Susan Leyborne-Popham) was born between 1 Apr 1885 and 30 Jun 1885 in Ellesborough, Buckinghamshire, England; died after 1919. [Group Sheet]