He is the s of Hon David Francis TENNANT 1902-68 (s of 1st Baron GLENCONNER 1859-1920 and as her 1st h Pamela Adelaide Genevieve WYNDHAM d 1928 (gd of 1st Baron LECONFIELD 1787-1869 who was s of 3rd Earl of EGREMONT 1751-1837, etc)) and as her 1st h Hermione Youlanda Ruby 1906-86 (the actress Hermione Baddeley & sister of the actress Angela Baddeley) d of William Herman CLINTON-BADDELEY 1867-1929 by his 25 June 1896 m (St Cuthbert, Kensington) to as his 2nd w Louise Rosalie c1878-1932 d of Capt Louis BOURDIN (French army) d before 1896. He m 1st 1964 (div 1973) Margaret Rachel b 1943 d of Hon Sir Ernest Stowell SCOTT 1872-1953 (s of 3rd Earl of ELDON 1845-1926, etc) and Winifred Kathleen BRODRICK 1906-90, and had two sons and a dau. He m 2nd 2004 (as her 3rd h) Frances Jane b 1937-2017 d of Sir (Charles) Richard FAIREY MBE 1887-1956 and his 2nd w and Esther Sarah 1906- d of Stephen Francis WHITMEY c1871-1959 of Parkstone, Dorset by his 1898 m reg Q2 Devon to Mary Tapley PARDON c1873-1940.