Margaret Ann Mason
born April 1870–April 1871
  in Gateshead, Co. Durham
died very roughly 1940

Maiden name from son John Dundonald's birth certificate.

1900: living at 18 Saltwell Road at the birth of her son John Dundonald.

1911 census: living at 28 Hyde Park St, Gateshead, with husband, children, and step-daughter. Her age is 40, and place of birth is Gateshead.