Why children should take care of their parents?

I don't think it's a matter of SHOULD. A lot of kids WANT to because they love their parents. Parents make a lot of sacrifices so that their children can have better tools in life to be successful. Not only that, but in good relationships, there is a bond with a parent like you will never have with anyone else. They are your foundation to a good life, no matter how bad things get, they are there for you and will always love you. I once heard: "Mother is like God in the eyes of a child". I felt that way when I was a young child, and I've never felt that way about anyone else since...that is special, and it should make people WANT to take care of their parents.