Mary Jane Cayzer was the daughter of William Cayzer (1858) and Susannah, and was born in Kennington in 1880. In 1899 she married William Henry V Oldfield (1878), the son of William Oldfield (1847) and Salome Elizabeth Emily Broughton. In 1901 and 1911 she was living at 9 Cranfield Street, Battersea.

Sources
• 1. 1901 Census. 9 Cranfield Street, Battersea. Mary J Oldfield. Wife. Age 21. Born Battersea. • 2. Marriage Registers. Oldfield, William Henry & Cayzer, Mary Jane. Jun. 1899. 1d. 914. Wandsworth. • 3. 1881 Census. 6 Aboukir Street, Camberwell. Mary Ann [sic] Cayzer. Daughter. Age 2. Born Kennington. • 4. 1911 Census. 14 Cranfield Street, Battersea. Mary Jane Oldfield. Wife. Married 12 years. Age 32. Born Westminster.