Daughter of William Howard Clive Montgomery of Rosemount House and of Greyabbey, Newtownards, Ards, County Down, Ulster, and second wife (m. 4 Dec 1965) Daphne Bridgeman (b. 9 Apr 1940) of the Viscounts Bridgeman and of the Earls of Bradford, Viscounts Newport, Barons Bradford and Bridgeman Baronets, of Great Lever, who is a descendant of Mary Tudor, sister of Henry VIII.