My fmil is insisting that she is going to be inviting friends to the rehearsal dinner that she is not inviting to the wedding. I told her that it isn't right, but she wouldn't listen and told me that her friend planned a rehearsal dinner and that it is fine to invite people to the rd that you can't afford to invite to the wedding. I am so embarrassed thinking that some people may be offended by the invite to the rd and not to the wedding and it may cause some confusion and they may end up showing up at the wedding. What should I do? I have been looking online for articles that explicitly say that it is bad taste and bad etiquette to do so, so I can send her the link. Any thoughts? Am I crazy, is it ok?