I am not too sure on how to address invitations for two different families. First is my aunt, uncle & three cousins - I know everyone over 18 gets their own invitations, but the kids are 10, 15 & 17. We aren't using inner envelopes, so I cant list the kids on the inside, and I don't want to use "And Family" in the address. Do I just write everyone out on one invitation? Or send one to just the kids? The other family is pretty much the same, except they have 4 kids who are all under 6. Obviously with this one I wouldn't send the kids their own invite, but is it ok to use "And Family"? I'm not very good at figuring out all this formal stuff!