I have somewhat recently started using Ancestry.com, so just a fair warning that I'm still learning how everything works!
That being said, I am the child of my biological mother, who I know, and an anonymous sperm donor, who I do not.
The other day I got a match saying "Close family - first cousin." I messaged the guy since I assumed he'd also be a son of this sperm donor.
This is where the story gets confusing.
I'm 22 and he is 24, we're from the same hometown, and he looks a fair amount like me. Our DNA shows that we have 1866 centiMorgans of DNA in common across 64 DNA segments. So almost 100& certainly half-siblings.
But when I reached out to him, he said he had no idea why our DNA was showing us as related. When he asked his parents, they confirmed that they are his biological parents and that they did not use a sperm donor, nor was his father a donor.
His dad is Creole, but my ancestry didn't show any of that heritage. My biological donor also self-reported his ancestry, which did not include Creole at all. I know he is not related to my maternal side since my mom hasn't had any other kids and it doesn't seem likely he's a long-lost brother of my 67-year-old mom (assuming he's actually an uncle).
I'm stumped. It doesn't seem possible for this guy to be my half-brother. But our DNA match is incredibly strong and we're from the same city.
Does anyone have any idea what is going on?