So I have a problem. I have a few guest on my fiance's side that have significant others that are.. let's be blunt and say I am not a fan of them based on several factors. I want his guest to come but I do not want them to be under the assumption that they are able to bring their significant others. I don't want to come across as mean or rude, but as a couple my fiance and I decided that their plus one should be revoked. How do I do this in the most diplomatic way possible as to avoid unnecessary drama?