Therapy brought up a lot of anger for me too. Towards my father and a sibling. I talked it through with my T, not with my family. My family doesn't handle emotions well, they suppress almost everything. That's what I used to do too, before therapy. It's why I ended up in therapy, I burnt out.

I don't think my family will understand what I'm feeling or don't know how to handle it, and I think I'll only get more frustrated if I try to talk to them. So I talked a lot about it with my T and put most of it behind me, or at least learnt to deal with it.