This is my first wedding, my fiance's second. He does not have any children and we have nothing to do with his ex. However, we just saw that his sister and her husband have been hanging out with his ex. We aren't sure how long this has been going on without our knowledge. It doesn't bother my fiance very much, but I feel extremely betrayed. At the very least I no longer want either of these people in our wedding party, and at the most I am feeling incredibly apprehensive about marrying into this family that might rather still have the ex around instead of me. Does anyone have any advice for how to handle this? My family doesn't have any divorce in it so I do not really know what the norms are in these situations. Maybe I don't really have anything to be worried or angry about, but it doesn't feel that way. Thanks everyone.