EDITING & REWRITING POST: 1,000 characters is not enough to explain this mess. Let's try again.
FH & I are starting to discuss the guest list. He has expressed that he doesn't want one of my cousins there nor does he want one of my parents there (parent has treated me horribly and has seen first hand the emotional abuse I've endured) he wants parent to recognize how much they've hurt me before inviting them. I'M FINE WITH THAT and I agree with him.
I am not close to his sister because she is close to his ex, but he wants her there and so do I (don't know why I brought her up the first time)
My parents are divorced and this parent will not be helping pay for anything in the wedding.
My question is: have any of you not invited a family member and how did you have that conversation?
(original post will be in the comments)