Tell me if I’m trippin

Ok I’m pregnant with my bf kid currently 25 weeks, I live with him and his family but I pay rent every month without his help. I guess they planned a trip the other day and I wasn’t including he didn’t tell me about it till right now and I told him how messed up it is that they are all going to Orlando on a 3 day trip and not even include me or my son. He said his sister wants to lock the door so I won’t be able to come out the room into her house, the room is connected to a studio in the back but I just think it’s soooo messed up, like I know she doesn’t like me but wtf is this. He then tells me she’s not my family so why am I even getting mad. That he has no say in it but I know dam well if I had my baby by now she would be including me. At this point I don’t even want to go. And yes I’m trying my best to find a place of my own the disrespect is real