I am 44, my half sister from my father's second marriage is in her mid-20s and getting married. The wedding is on the other side of the country, my out-of-pocket expenditure including black tie dresses and hotels and everything else will be over 5K. I just found out that my mother's brother and sister are going to be invited to the wedding. My parents have been divorced for more than 35 years, and this is my father inviting his ex-wives siblings. Both of these people, we will call them CeCe and Saul, have been emotionally abusing me my entire life. I have no contact with them, I have no relationship with them. Neither of them, as far as I know, have any relationship with my half sister. They're just there to be friends with my dad. I guess. I would like to send my aunt CeCe a letter asking her to stay home. She's not local to the wedding, it would be a big trip for her too. She doesn't know my half sister, they may have met a few times but there's no real connection. CeCe is in it for the fancy Boston wedding and the food and the dresses and all of that b*******. I just want to celebrate my half sister's wedding. Is this beyond me, and I just need to stay home? At least I know my own boundaries, and I know that I can't be around this person and behave in a way that is appropriate to a celebration. I just don't know what to do. (Wouldn't it be nice if I could just talk to my dad about this? It's not an option. He doesn't even answer the phone)