My fiance and I got engaged about 1.5 years ago. Not long after, my father and his long term girlfriend broke up. They had a kid together, my brother, who I love and she had a kid before the relationship, who I also get along with wonderfully. I see them as my family. The problem is that after they broke up, I continued to have a relationship with the kids but not with her. And it hurt because she was another parent to me for a long time.
Now, we don't talk at all. And I don't really want her at the wedding. But her and my dad still get along and I don't know how to tell them.