Like parents have responsibilitites, children too have responsibilties. Children have to take care of their elderly parents. They depend on you kids and they trust you.  Whether the parents took enough care of you or not, it is your duty to take care of them when they can not live on their own.

Your parents may have been bad parents. Parents are not someone for you to take revenge on. Revenge is not right action any how.Everyone makes mistakes sometimes even serious mistakes. Still, you have to forgive them and take care of them.