He was s of Capt William Wentworth STEWART-FITZROY 1907-98 (3xgt gs of 1st Baron SOUTHAMPTON 1737-97 who was 2xgt gs of King CHARLES II) and his 1st w Margaret Patricia c1912-1984 d of Douglas Stewart GRANT of New York. He m 1960 Susan Elizabeth b 1939 reg Q3 Hants d of Capt Horace Gerald SOUTHWOOD CBE DSO RN 1912-97 and Ruby Edith 1911-2005 d of Charles Jesse HAYES 1873-1936 by his 1905 m (Tamworth, Staffs) Daisy May BALL 1883-1969, and had three daus as above.