America's most inbred family tree
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DailyMail.com has tracked down several birth certificates which show the Whittaker family inbreeding started with twin brothers John and Henry Whittaker in 1887.
John married his own first cousin Ada Riggs – the daughter of Mary Perkins who was the sister of John and Henry's mother Eliza.
Ada and John had nine children, including Gracie Irene Whittaker who was born in 1920.
John's brother Henry married Sally Burton and they had seven children, including John Emory Whittaker, born in 1913.
Gracie and John were first cousins, but married in November 1935 and had their first daughter Aileen Violet Whittaker in 1937.
Aileen was the first of 15 children that the couple had, with several being filmed for the documentary filmed b Soft White Underbelly in 2020.
