Creepy Vibes
Similar to the previous post, this person got in contact with their biological sibling. Well, it was the sibling who sought out the OP. At first, things were pretty good, but when the brother started acting all brotherly to the OP, they became weirded out and cut ties pretty quick.
Things came to a head when the OP’s bio-mom invited them to a family reunion. What in the world? Look, lady. You clearly knew who adopted your child, and after umpteen years, now you want to reconnect? And at a family reunion? We’re not British, but we think the most appropriate phrase in this situation is piss off.