What is the protocol for inviting younger guests? A lot of my fiances cousins are colleged-age and we're not sure how to invite them. Do you send them a separate invitation or can you put them on the same invitation as their parents?
What about the ones who will still be in high school when the invitations go out, but will be freshman in college at the time of the wedding?
Also, what do we do about plus ones for them? In my head they're kids, but I know in reality they're young adults and are possibly in committed, lasting relationships. (My fiance and I met my first week at college, so I really do get it.) He's not very close to them, though, at least not the way I am with my family, and we don't know if they are seeing anyone. Should we ask the aunts/uncles? (They can most definitely have plus ones if they are in relationships and are invited separately.)
Really, we're just confused about whether or not they are considered kids or adults in the world of ettiquette. I was only invited to one wedding while still in school (a friend of mine who's mother happens to be friends with my mother so it's kind of a weird situation) and I was included on my mother's invitation which was totally fine with me. If that isn't standard practice, though, it would be good to know.
Thank you!