He was s of Gp Capt William George DEVAS CBE DFC AFC RAF 1912-2001 scion of that gentry family of Hunton Court and Monica Mary Cecil 1917-2009 d of Henry Francis Hobart KERR 1878-1972 (gt gs of 6th Marquess of LOTHIAN 1763-1824 by his 2nd w Lady Harriet SCOTT 1780-1833 d of 3rd Duke of BUCCLEUCH 1746-1812 who was 3xgt gs of King CHARLES II, etc etc) and Gertrude Mary c1878-1969 d of James ANTHONY. He m 1970 as her 1st h (div 1983) Hon Penelope Ann O’NEILL b 1947 d of the LP Baron O’NEILL OF THE MAIN 1914-90 (gs of 2nd Baron O’NEILL 1839-1928 and Lady Louisa Katherine Emma COCHRANE 1849-1942 d of 11th Earl of DUNDONALD 1814-85) and Katherine Jean 1915-2008 d of William Ingham WHITAKER 1866-1936 (gs of Joseph WHITAKER who was f of Sir Albert Edward WHITAKER 1st Bt CBE TD 1860-1945) and Hon Hilda Guilhermina DUNDAS 1877-1971 d of 6th Viscount MELVILLE 1843-1926 and his 1st w Grace Selima Marion SCULLY 1851-90, and had a son. He m 2nd 1994 reg Q2 London as her 2nd h (her 1st was Michael Phayre-Mudge) Veronica Susan b 1944 reg Q4 Surrey d of Lt-Col Eric Surtees SCOTT MBE 1912-2005 (gs of 3rd Earl of ELDON 1845-1926, etc etc) and Rose Anne STEWART 1915-94 (2xgt gd of 7th Earl of GALLOWAY 1736-1806, etc).