I have a single guest whose invitation was invited only to her and her RSVP came today and it says she is bringing a guest. Her BF is a class A douche to her, we don't get along because of it, and her brother, who is a good friend, is coming and will probably beat the hell out of him. She is fully aware of all of this. I have left her a message asking who her guest is. IF it is the BF instead of her daughter, how can I tell her politely that he is in absolutely no way to come to the wedding or he will be escorted off the premises?