So my wedding planning up to this point has gone really really smoothly. There haven't been any feelings hurt, and I had managed not to offend anyone. But I think my FMIL thought it was going to perfectly... I'm having my FI's two sisters be two of my eight bridesmaids, because I know them, and we're friends. The rest of my bridesmaids are girls I've been best friends with for years. My FMIL apparently thinks it's okay to decide who gets to be my bridesmaid, because she told my FI's brother's wife (who I've met once for half an hour) that she got to be my bridesmaid. When my FI told her that we weren't having his SIL be a bridesmaid his mom got furious and told us that we were breaking all the rules and that we need to tell his brother that his wife isn't going to be involved in our wedding. So we called him and asked that his wife stand up during the rehearsal dinner and say the top ten things you need to know when living with one of the family. But then she went behind our backs to try to get her the same dress my bridesmaids are wearing. Now my FI and his mom are doing battle and his sister-in-law is caught in the middle, and I don't know what to do about it.