However, this works both ways. This relationship often evolves into their children working as servants, cooks, a laundry service, drivers and house cleaners for their parents, thus either saving their parents a lot of money, or facing great difficulty getting to medical appointments, eating poor quality microwave food, living in filth and squalor, etc.
Having adult children living with their parents may effectively extend the lives of their parents by decades.
If the children have employment beyond this, it still costs them years of not being married or having children, but gives them an opportunity to erase college debts, and save up money on the chance that they will be able to afford marriage and children, which fewer and fewer are able to afford these days.
As it should be, to a certain degree.
The book “The Millionaire Next Door” described this. Those who give economic outpatient care, whether as a home as a gift or money or property, don’t get wealthy because of the financial drain. Their children don’t get wealthy because they get trained to live beyond their means.