Let’s start from the beginning; my mom's best friend has three boys that are around my age. We call each other brother and sister because that is basically what we are just different parents. So we are talking about one of the boys and his ex-girlfriend (I'm not sure how long they were together but I know they lived together for 3 years). My sis and I had become really close with this girl to the point where we are all best friends; she is a bridesmaid in sis's wedding. He is an usher. So this is where the drama begins, he has a new girlfriend and we have heard from several people that he has all intentions of bringing this girl as his date (even though when they first broke up we asked that they do NOT bring dates, to keep the peace). So I am sick to my stomach thinking about this, my sis does not deserve to have her special day messed up because a fight breaking out at the reception. Also I know that if we ask them to leave if something looks like it is going to start there will be hard feelings. What do I do?