I was gonna yell SWEET HOME [fill in the blank]... Then I remembered I come from a worse place(country) in term of "that"... At least our generation MADE SURE cousin fing was over with...(Thanks to dictators forcing education ironically enough...)

Sara…🤣🤣🤣🤣

You're welcome, Natalia.

Then again, it seems to be quite a common fantasy if the popularity of a certain sub-genre of pornography is anything to go by. A quick search for stats shows that it is regularly in the top ten most viewed categories on PórnHub. which just goes to show that humans can be deeply strange.

Omg that is just unhinged to me... Like how are ppl turned on by that???

I have no idea.

I suspect that we will eventually find out that it's genetics evolved to prevent species extinction during bottle necking events where there are few if any real alternatives.

@UKGrandad: which category would that be exactly?

Incest, obviously.

It typically takes several generations of successive inbreeding for significant genetic consequences to arise. You're correct that it is possible in one generation if both parents happen to be carriers of a rare, detrimental, recessive gene, but even then the children would only have a 25% chance of inheriting two copies. The vast majority of children born from a single generation of close relatives will be absolutely fine, and rare recessive illnesses occur by chance with unrelated parents as well. There is a difference in probability, but in most cases it is the difference between a small risk and a remote risk. At this point in reproductive technology, anyone who knows they were donor-conceived should probably seek genetic counselling anyway.

Also, we don't know for sure what FIL knew or understood, or what he was told. Obviously, he had to have been aware that he had been a donor. Beyond that, though, it's not clear that he knew OP was donor-conceived at the time of the marriage. And he may have been misled about how and where his donation(s) were ro be used. With 40 half-siblings in a local area, it seems clear that the company/clinic/doctors involved were irresponsible, and both donors and families they worked with were probably largely in the dark about their shady practices. FIL had to have known that he might have other biological children somewhere, and he could have been more open about that (though this is true for any man who has ever been unfaithful, or had past intimate relationships at all, for that matter), but he may not have had any reason to suspect that his DIL specifically might have been his biological child.

@LB: She was not really banging her sibling, but her husband, who happened to be, unknown to her, somewhat related. It’s not like that he’s her „real“ brother, like growing up together in a house and sharing parents. She met him as an adult, fell in love and made a family together. I think there’s no need to put that much of a meaning into genetics. It really shouldn’t change anything about how they feel for each other