America's most inbred family started with identical twin brothers whose children married each other - causing genetic defects which have left some of them grunting instead of talking.The now-infamous Whittaker family grew up in a broken-down property in Odd, West , and have been known to communicate through grunts and barks.DailyMail.com can reveal that a set of identical twin brothers sparked the family's history of incest, with the children of Henry and John Whittaker getting married and having their first child in 1937.
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