We are having a very small wedding, with only about 50 people on the guest list. We cut several friends and even some family to keep costs down and things more intimate overall. Now we are less than three weeks out from the wedding and we are still receiving RSVPs, one of which has come in from a family member who has just included a guest on the RSVP, despite the invitation not including a guest. Now if I even knew this guest, or if this was a large event where it wouldnt make any difference if just one extra person came, then I wouldn;t really care. However, neither of those are true, and I've already informed other family members they cannot even come because we've chosen to keep things small and some friends that are coming that they cannot bring random guests. I am at a loss as to what to do with this as I know this person will likely be offended if I say their guest cannot come at this point, but I also know this guest will stick out completely at the wedding since only about 4 other people there will even know them, and I am not even one of the four despite being the bride! Is it so rude to think it's MY wedding so I don't want random people at it, even if they are "like family" to other family members? They can attend their wedding instead of mine! I'm just really not interested in dealing with drama this close to the big day, or on it for that matter.