 Doctor Susan Dimock was born in Washington, North Carolina, the daughter of Henry and Mary Malvina (Owens) Dimock.The family descended from Thomas Dimock who emigrated from England to Dorchester, Massachusetts in 1637 and later resettled in Barnstable, Massachusetts.Susan Dimock was a distant cousin of Ira Dimock (1827–1917), a silk manufacturer, and she was also related to Henry F. Dimock, a New York City attorney associated with the Whitney family business interests.