Her mother, Joan de Fiennes, was a daughter of William de Fiennes and a sister of Margaret de Fiennes, making Wake a cousin of Roger Mortimer, 1st Earl of March.
Her mother was a daughter of William de Fiennes. Her mother was a sister of Margaret de Fiennes. A daughter of William de Fiennes and a sister of Margaret de Fiennes was making Wake a cousin of Roger Mortimer. Roger Mortimer was 1st Earl of March. Joan de Fiennes was her mother.