The way I see it, parents have obligations regarding their children, but not the other way around. Children didn't ask to be born, it's the responsibility of their parents. I don't think it means that parents should sell their houses for their children, though. Parents are responsible for providing an adequate standard of life and ensuring that their children obtain basic education. Then it's up to parents how much they want to help and up to children how much they want to take care of their parents when they get older.
Viewing children as an investment into your own future is very egoistic and pragmatic. I don't think it's a good foundation of a healthy relationship.