I've read that the proper etiquette is to send individual invites to people over 18. I have 3 over-18 cousins who all live at home with their parents (same family). It seems ridiculous (not to mention expensive!) to have to send 4 separate invitations to the same house, so I'm going to send just 1 invitation to the whole family. Take that, etiquette! Is anyone else here a rebel too? 