thelonewolf266 said:
I don't believe its wrong but they shouldn't be allowed to have children as they could be messed up due to genetics and that science stuff I hear so much about up.
Deep, man.
Let alone that said defects could occur within ANY delicious genetic soup that any two humans cook up, regardless of relationship proximity.
The main problem with incest is if you happen to carry recessive genes that cause health problems, if you spring out a sprog with a partner of close relation they'd likely have those same recessive genes, and those genes are likely to be much less recessive in said kiddie.
That's not to say that any child born of this unusual union is going to be crash band wallop horrible cripple mutant, just that it's more likely than otherwise.
Successive inbreeding over multiple generations amplifies this risk considerably, which is where all the trouble starts.
The occasional one-off case isn't going to be all that damaging unless you get really really unlucky. but if you're going to get THAT unlucky you likely have a condition that could cause problems no matter who you're getting your freak on with.
Hell, one could make a case that it STRENGTHENS familial genes by reinforcing one geneset with a second copy, but I don't know too much about that so I can't comment with any sort of authority.