Parents choose to have a child and should have the responsibility to care for them. Despite this, there are still mechanisms by which parent can legally abandon their children. Children do not choose to be born, so the moral contract is different. I would agree that most people who were cared for as children should care for their elders, and should want to. But what if they hate or despise their parents. Do they “owe” for what the parents did despite never agreeing to the obligations.