My partner and I have been working on our guest list and we've hit upon a stumper.
There is a couple I plan to invite who are very close friends of my family: Mr. and Mrs. O. My much-younger sister happens to be best friends with their daughter M. Now my sister is extremely shy and quiet, and she will have just turned 20 at the time of the wedding, making her the only under-21 guest. Knowing that she is going to feel extremely awkward under those circumstances, my fiance suggested that we invite M so she has someone to talk to.
I think that is a great idea! I like M, and I know her fairly well since she came over to play a lot when I was growing up. My only worry is that Mr. and Mrs. O have 2 more children at home who will be 19 and 17 at the time of the wedding. Can I invite the parents and one of the kids but not the other two? I don't hate the idea of having them there, but I have no personal relationship with either of them and I know they would be bored. Plus I think the parents would have more fun if their kids weren't there. (M. would find a quiet corner to hide out with my sister.)
Thoughts? I'm leaning toward inviting them all since I don't want to hurt any feelings, but then I know that they would feel obligated to come. It is worth pointing out that they all live about 2 hours' drive from me, so it's a moderately big deal effort-wise to attend.
Oh, and we are expecting about 100 total guests, so not tiny but certainly not huge.