Well, in three years, your two oldest will be out on their own or at college, so that leaves a 15-year-old high school student. You d need to consider where you can find a job and where there would be a good high school for him/her. There is a book, Places Rated that gives the various facts about different cities - check your library or bookstore or on line. The Labor Department website would have info [very general info] on job outlooks in various cities for various occupations. Your library would likely have a lot of books with the kind of info you ll need. Or you can do on-line searches for the info. You d also want to visit the places you re interested in, to get a taste of what they re really like. It will take some time, but you ve got three years.Good luck to you!
ft.l i live here its cool