As someone whose kids are both (ages 27 and 23) finally out of the house in the last couple of years--but no grandkids yet--I totally get this. I've very much gotten used to having my own time FINALLY, being on my schedule, etc. My son and his fiancee have talked about moving back in with us for a year or two to save money, and the prospect does't sound that appealing to me at this point. I'm happy that our son thinks he's always welcome back, and he is, but it will be an imposition if they do it.