My parents have a family friend who has a son, and my fiancé and I have know him since childhood. He's a pretty decent friend not super close. Now this guy is dating my ex best friend from many years back, from early high school. The end of our friendship was ugly, I don't hold grudges against her but I absolutely don't want her at our wedding. This guy already texted my fiancé asking if he could bring her. My fiancé said that we are over capacity and don't have space and we'll let him know. We may have space after a few declines, but there's other people I'd rather invite from my B-list over her. Regardless, I don't want her at our wedding. Now his mom talked to my fiancés mom saying that she will give up her seat for her. So we can't use the capacity as the reason and I don't know how to handle this because I really don't want her there. My fiancé wants me to let it go and let her come. He thinks saying anything will causes drama between our parents and his mom. Help.