As 2gypsies ---- said "Also, what would you do if they got jobs away from you? Millions of people are in that spot."
This is not unusual at all. We have 4 children that are all grown and 7 Grandkids, 3 of the 4 children live more than 800 miles from us. The reason is for better jobs and career advancements. One of them lives about 15 minutes away but they are on military orders and will be moving overseas or at least 2800 miles away within the next year. So not seeing the grandkids every week is going to be the norm. We have the technology to talk/video with them and in a couple of years (retirement) the RV to go visit a week or so. As the grandkids have gotten older they have moved on also and don't want to spend all thier time with the old people (us). And as they get a little older, marry and move to different places that is going to make staying together alot harder.... so life goes on............