I've looked around and wanted to see what the etiquette was for addressing Save the Dates and Invitations for certain circumstances. For instance, I have read all over that any guest over the age of 18 should get their own STD / invite. Ok, that's fine. BUT - does this count if they live at home? I have a few guests on my list who are well over 18 and currently reside at the home of their parents. Is it wrong to include them on the same STD? What about the invitation? I am guessing that they still get their own, but figured I'd ask. To me, it seems silly to send 3 STDs to the same house (and same for invitation!) but I want to do what is proper...