This is strictly my own opinion, but I feel when he left his ex he shouldn't have looked back. He's with you now, and his ex or her family shouldn't be any part of your lives. I was married before, and when I remarried, my ex's brother's and his sister wanted to keep in touch with me, but I realized this would make my husband uncomfortable, and that was a life I had before and it didn't fit in with my future. I phoned each one of them and explained the situation and they understood. If there is a different situation going on here that you couldn't post, then go to the family function and enjoy it. However, I find it really bizarre, and I don't think you should be put in this situation. If he wants to go let him, but don't feel forced to go. Good luck Marcy