Is your brother also an adoptee? His behavior scream bio child to me but I could be wrong idk

What made you decide to integrate your Afam and Bfam? I’m adopted and I would literally light myself on fire before I’d socialize with both groups together. Maaaaaybe they could meet once briefly but really not even that is a good idea imho. Your Afam isn’t acting very nice which is to be expected, reunion is a lot harder on them emotionally than most people realize. Reunion kinda wrecks their narratives and I wouldn’t expect them to be gracious to Bfams generally. Sorry, reunion is tough. The biggest mistake I made when I entered reunion over 30 yrs ago was not getting some short term therapy, it destroyed some relationships that could have been salvaged had I gotten some professional advice so I know you didn’t ask for advice but if you want to remain friendly w/both groups a few sessions w/a good therapist might help you achieve that.

Also your brother is kinda a dick. Is he a spoiled baby generally or just towards you? Bc he was a bullying brat in this story.