Part of the answer there is, they're housing their family with their parents' home, cutting out the interest payments to the bank. In return, the parents are sa

Part of the answer there is, they're housing their family with their parents' home, cutting out the interest payments to the bank. In return, the parents are saving the cost of assisted living in the various sorts it takes, further adding to the efficiency. And then to boot, the parents, for a time anyway, are available as childcare. The amount of money that can be saved this way is nothing to shake a stick at. It may not be what most people want to put up with, but it's not without its financial benefits.