The whole gene thing is a bit misleading. If two family members have a kid, the child is not guaranteed to be "mutated" or anything like that. If there are genetic abnormalities in the ones having sex, then there is a chance the genes would show up in the kid. However, if the genes are pretty good, there is little chance there will be anything wrong with the kid. That's not to say that incest is not gross, but as far as genetic go, it's not much of a problem unless you come from bad stock.
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