Arthur Michael Cosmo Bertie was born 29 September 1886 to Montagu Arthur Bertie, 7th Earl of Abingdon (1836-1928) and Gwendoline Mary Dormer (1867-1942) and died 2 February 1957 of unspecified causes. He married Aline Rose Arbuthnot-Leslie (1888-1948) 15 May 1929 . He married Lilian Isabel Cary-Elwes (1902-2000) 7 May 1949 .
|Offspring of Arthur Michael Cosmo Bertie and Aline Rose Arbuthnot-Leslie (1888-1948)|
|Richard Henry Rupert Bertie, 14th Earl of Lindsey (1931-)|