I commented on another thread but then decided this might be an equally loaded question. I haven't made any concrete decisions on the guest list yet, but we were thinking about inviting kids and hiring someone to just entertain them rather than the babysitter be totally responsible for stranger's kids. To me, "kids" is anyone who needs a babysitter, but based on everyone else's comments, I'm under the impression that anyone under 18 is generally treated the same at a wedding. I am able to invite people's families since the wedding will be buffet-style at my house, but I was doing it mostly so people can make their own decisions about childcare. If I do this, I suppose I have to invite people's "big kids" too, right? What about my boss' 17-year-old daughter for example? And if I invite her as a "kid", then do I have to treat my 16-year-old cousin as a kid too? I was going to allow her to bring a guest because I didn't want to treat her like a baby. Ahh, so much etiquette I don't know!