Well, yes, the great news is that you will be going back to a therapist. I hope you will talk about that and how it makes you feel as the time approaches. It really should help you a lot.
I can't imagine why anyone would question your right to feel uncomfortable around your perp brother, especially since he seems to feel he can do what he wants. If I were in your shoes I would feel exactly the same way that you do.
I have been saying this a lot to day, it seems, but I'd like to do it again here because it's something you need to hear. Guys usually think they're supposed to be tough and self-sufficient, and survivors often put a different spin on that by refusing to ask for the help they need.
Don't fall for this one, okay? You have every right to be safe and unafraid in your own home. If this can't be worked out somehow, then ask your parents about it and say how you feel. Ask for the help you need.
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)