When first discussing the guest list (max 80; 70% is family) with my father and stepmother, my stepmother named 10 people she thought we should invite. Her top two are her and my dad's best friends (who are married to each other). However, when my dad and stepmom met, he was still married to my mom. There are other stories of my dad's best friend not respecting my parent's marriage, but this is why I have never planned on inviting that couple to my wedding. Conversely, my mom never named anyone she'd want to invite. I wanted to invite her lifelong best friend and her family, because I've gotten to know them over my life; I went to their wedding as a child and have been like a sister to their two daughters. I initially put that family on the B-list, and now there is room for them. Do I invite them and risk infuriating/upsetting my stepmom (and perhaps my dad), or do I avoid it to skip the drama? I would love that family to come, but I don't want there to be an issue at the reception!