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Originally Posted by StormBerlin
If I remember correctly, chance of birth defect is minimal with immediate family as well. Birth defects are only prominant when there are many generations of inbreeding. And even then, it's stuff like webbed toes.
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Well I'm going to make up some statistics that I think are close to the ones I've seen: first cousins = ~1% chance of genetic disorder vs siblings = ~5% chance of genetic disorder
And yes, I believe they were first cousins.