As the festive season swings into high gear, millions of Americans are packing their bags and loading into planes, trains and automobiles (and maybe a sleigh) to head home for the holidays. And according to the numbers from NYT Upshot, most of them aren’t going to be traveling very far. It turns out that the typical American lives only 18 miles from mom. That number represents a few key trends. More families are leaning on each other for financial support. Baby boomers have reached an age when they often require additional care. And for many Millennials, visiting one’s parents amounts to little more than walking upstairs from the basement. And if my personal experiences are any indicator, there’s one more key factor keeping families in close proximity. Tech support.