Town shocked after 16 kids looking like "almost feral animals" rescued from deplorable Ohio home

How many generations does it take for inbreeding to produce handicapped or plain dumb children? Surely not just 1?
 
How many generations does it take for inbreeding to produce handicapped or plain dumb children? Surely not just 1?
Just 1.

Sibling breeding and parent\child breeding give a high chance of disabilities, the chance just gets higher the deeper the inbreeding goes.
 
I always wondered if the reasons some countries are backwards is because of the common trend where cousins get married. I mean after generations of that inbreeding it must start affecting how they think.
 
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