It's still 6 years before a decision has to be made. Regardless though, you don't have to full-time and you can make shorter jaunts with your camper. Do 1-2 months at first and see how it goes. Just because there are kids/grandkids it doesn't mean you give up your travel dreams for them. They also have things that they'll want to do and they probably aren't going to consider whether you're there or not. Consider that families live apart all over this country all the time. Be thankful for the time you do spend with one another.