PenPenWrites

A recent blog on Tellinitlikeitis, looks at the issue of what we owe our adult children. Grown children who demand help buying a house or regular babysitting or loans that are really gifts–that can feel like parental failure, and parents may be culpable for being enablers when this happens. Many of us get much joy from giving our children gifts–significant gifts such as help with a down payment on a house. But things can get out of hand.
For those in that position–their adult children are demanding, whether it's for goods or services–may be interested in this point in the blog:

"When children become adults, parents do not owe them a down payment on
a house or money for the furniture. Parents do not have an obligation
to baby-sit or to take their grandchildren into their home when the parents go on vacation. If parents want to do it, it is a favor,
not an obligation. Parents do not “owe” their grown children financial
help or an inheritance regardless of how much money a parent has.
Parents must learn to cut the financial umbilical cord for their own sake and for the sake of their children."

Here are some books that address the point: Eileen Gallo and  John J. Gallo,: Silver Spoon Kids : How Successful Parents Raise Responsible Children; Gary W. Buffone: Choking on the Silver Spoon: Keeping Your Kids Healthy, Wealthy and Wise in a Land of Plenty.