|Marriage||He married Jean Eleanor Dart on 4 April 1916 at St. Marks Church, London, Middlesex County.|
Source: 014563-16 London, Middlesex Co. Osbert William Sumner, 24, born and residing London, bachelor, jeweller, Methodist. Parents Charles Robertson Sumner and Clara Roche. Jean Eleanor Dart, 20, residing 22 Erie Ave., London, born London. Spinster, Church of England. Parents: Thomas Buttingham Dart and Elizabeth Kingdom. Witnesses: Geo. S. illegible, 552 St. James St; Josephine illegible, 1174 King St. Clergyman: A.L. Beverley, 1357 Dundas St., London, Church of England. At St. Marks Church.