We are having an adult only wedding so my husband's friend texted us last night and asked if we would mind if their friend came with them to watch the kids while they are at the wedding. Under normal circumstances, I would be totally fine with it, but the friend they want to bring is my fiance's ex. She has never really gotten over my fiance and has admitted to blocking him on Facebook because it hurts her to see him happy with someone else. I feel really weird about her being around for the weekend of our wedding. Our venue is the hotel we all would be staying at and we plan on having a brunch the next morning that our friends are invited to so it is very possible we would see her. We don't really know how to respond to them. Any advice?