I see everywhere that it's ok or not ok to allow a plus one. My question is on the RSVP...how do you ensure that the person(s) won't just bring not just a plus 1 but their kids, etc? I didn't think of this and now I'm trying to figure out RSVP wording. Do I need to add a note requesting that they list who's coming? ASSUMING that people aren't going to bring their entire families would be useless, as some folks don't care about costs to the bride/groom. I'm more than willing to add some kind of wording on the RSVP but I just don't want it to sound crass (if that's possible)!!