We are recieving our rsvps and someone replied that was not sent an invitation. I have a pretty good idea that my FH's aunt gave them her son's rsvp card (we recieved the aunt's rsvp, her grown daughter's rsvp, but not her grown son's rsvp who is in the wedding btw). She asked a few months ago if they could be invited and I told her no. We don't know them and are trying to cut back on numbers. They are FH's aunt's family friend, not even my mother-in-law's family friend. I was told to expect some weird rsvps but never expected anything like this. What do I do? Tell them they can't come? We are already nearing our max number of guest for the venue and budget.