Humberto
Don't worry, I've got a certificate
America's most inbred family who speak in grunts began with identical twin bros
The Whittaker family have heartbreaking genetic defects which have left some of them grunting and barking instead of talking - and they are cut off from civilisation in there shack
www.mirror.co.uk
Meet the Whittakers: Inside ‘America’s most inbred family’ that speaks in grunts
Their family tree is self-pollinating: Inside the lives of a heavily-inbred West Virginia family that only communicates in grunts and barks at passersby.
nypost.com