I have a lot of half-siblings. One set of two, one set of 3 (I've only met the oldest), one only child, there's me and my two full siblings, and the donor's actual child. There's more out there. Another we matched with their child, but I don't think we even know their name. Been pretty cool meeting all of them and the donor. Its actually been a happy experience, but one certain people had no choice in making.