Unexpected guests....

I will start off by saying I have a huge family, both of my parents are one of 6 children making many aunts, uncles and cousins. Needless to say my FH and I have been trying to make cuts where ever we can. I have a cousin who lives across the country an I know he would not be able to make the trip back east for the wedding but I also know he will not RSVP to add to it there has been a huge disconnect with the rest of the family. So with these facts I had made the decision to not invite him. But today I ran into another cousin and I found out that first off that the other cousin is moving back and is very excited about the wedding(to which he was not going to be invited) we have not sent the invitations yet so adding two more we can make work. But my question is I have 3 adult cousins and an uncle living under one roof. I am inviting all of them now plus guests, but what is proper send 4 invitations to the same house or a family invite. I am thinking separate due to them being adults.