Just wanted to add one point....
Even if you didn't do nuch in the way of chores while you lived at home, it seems that as your parents get older, you become more of the parent and they become the child. Therefore you get to do many of the chores/duties that your parents use to do for you.
That's another reason while it is wise for parents to always treat their children with respect. One day most likely the tables will turn.
I always wonder how parents could reject or shun their children knowing that as they become older these are the people who will take care of their needs, not the elders or the GB.