***Longish post*** HELP! It is 26 days to my wedding and we just got a reply card in from my fiance's aunt and uncle and their family. I was EXTREMELY careful when addressing the invitations and did an inner and outer envelope. On the outer envelope I addressed it to Mr. and Mrs. and Family and the inner envelope had the names of everyone specifically invited to avoid confusion. My fiance's aunt handed the reply card to my mother-in-law and said that her daughter's boyfriend was coming. They filled in 6 meals instead of 5 but did not even fill in the boyfriend's name. I do not know the boyfriend and have never met him. I have seen the cousin maybe 5 times over the past 7 years. His cousin went to high school with me and my sister and always had an ongoing feud with my sister who is also my MOH. I do not even want the cousin there but of course had to invite her if we were inviting the rest of the family. We are having a very small wedding with only 61 guests and therefore did not offer a plus one to anyone. You were either invited or you weren't. We have already had to tell people on my side of the family that their SO could not come. We cut it off on married spouses or if you were living together. Since she is not my family and I am not at all close with her, how do we go about telling the cousin that her boyfriend can't come? I should also mention that their table is already full. Any help is much appreciated!