Background info: his sister and I do not get along. She did not ask me to be in her wedding party even though I was the only sibling’s significant other that was not asked. I was not invited to attend the rehearsal lunch either. Fast forward to my wedding. She is not in our wedding party but her husband is so literally same situation, different wedding. Now she’s the only sibling left out. We have a very large wedding party so we are only inviting those actually standing up in the wedding, doing a reading and our parents to the dinner. Must we invite her? I realize it’s a petty situation but I’m not going to pretend to be friends with someone who has been nothing but awkward and rude to me for past 5 years. No one batted an eye that I was not invited to her rehearsal. What should I do? Before you say invite all the wedding party’s SO, we will not be doing that because this is a thank you dinner for those directly involved and spending money and giving their time to be a part of our day.