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I always figured a child of incest would be cross-eyed or have three eyes or something. I guess I was wrong.
Most really bad recseesive genes dont affect us. But if your parents are closely related, you have a higher chance of having recessive traights. That is why the children all have blond hair and not dark. Dark is dominant over blonde, but with siblings being parents, you might have recessive gene issues.
Think of dogs. Hip displasia in labs is very common due to interbreeding. Its a recessive trait, but most labs have it.