So FI's brother's neighbor who was not invited to the wedding invited a girl from my work who I cannot stand (talks about me behind my back and gives attitude all the time, just plain rude). And she said yes to him. However, he was not even invited. FI says we have to invite him since they hang out occasionally work together sometimes and FI's brother told him he was invited. But I really do not want the girl going. There are many other coworkers that I like much better who were not invited so I can't stand the fact that this person will be there. What should I do??