- Father of writer/director Arthur Rankin Jr..
- Nephew of Lionel Barrymore and Doris Rankin, John Barrymore, Ethel Barrymore, and Gladys Rankin (Mrs. Sidney Drew) and Sidney Drew.
- Son of stage actress Phyllis Rankin and adopted by her second husband, actor Harry Davenport; grandson of McKee Rankin.
- Half-brother of Dorothy Davenport, half-brother-in-law of Wallace Reid, half-uncle of Wallace Reid Jr.
- Cousin of S. Rankin Drew.
- Wounded in World War I and consequently spent "a year and 18 days" in the hospital.
- Step-brother of Kate Davenport.
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