Much of what seems to have held parents and adult children together used to be grandchildren; with fewer people having children of their own, and waiting until

Much of what seems to have held parents and adult children together used to be grandchildren; with fewer people having children of their own, and waiting until later in life, that might be a lot of cause of the estrangement. Anecdotally, I've noticed a lot of people in their 20s or 30s get much closer to their parents when the first kid arrives.