Son of Michael Flanagan, labourer, and Johanna Sheedy. Married Gertrude Ginman on 14 April 1915 at St Peters Roman Catholic Church, Surry Hills and had issue, 2 daughters (Joyce and June). Marriage dissolved on 14 March 1939 (registered 15 June 1939).
Died 3 March 1949 at St Vincent's Hospital, Darlinghurst of a cerebral abscess.
Buried Congregational Cemetery, Randwick on 5 March 1949.