It isn't contained to single cities. I don't know of a single family I grew up with where at least one if not all of the kids no longer live in the city they grew up in. Same goes for extended families. My cousins are scattered across the country as are my husband’s. I’m around and so are my aunts and uncles, so my parents aren’t lonely, but I think this is more the exception than the rule. I don’t think this can be boiled down to a city transportation problem. There is a larger erosion of community stability that needs to be addressed across the board.