so i'm trying to address the save the dates and there are a few households being invited that i'm unsure how to do the addresses. One is a brother and sister who when we send the invitations will both be allowed a guest- do I send them each their own invites/STD's? or there is one family who has two young adults (we aren't having kids) that are being invited do they each get an their own STD or do we just write "and family" then when we send the invites send each their own? i've already read up that the "and guest" doesn't have to be declared on the STD being that things may change budget wise by the time you send the formal invites
SO how to address the STD for a for people who live together but are family members with each other.