Fitzgibbon's first, brief, marriage was to Margaret Aye Moung, but during World War II he met Theodora Rosling. They married in 1944 and lived at Sacombs Ash, Hertfordshire, from 1951 to 1959, but had no children. Theodora wrote of their time together in her, partly fictional, memoirs With Love (1982), and Love Lies a Loss (1985). The union also ended in divorce in 1960.Burke's Peerage 2003, vol. 1, p. 1150
