Ethicist: An action is wrong if it violates a rule of the society in which the action is performed and that rule promotes the general welfare of people in the society
An action is right if it is required by a rule of the society in which the action is performed and the rule promotes the general welfare of the people in that society
Edward's society requires children to take care of their aged parents. Edward's taking care of his aged parents is the right thing for him to do because the rule requiring this action promotes the general welfare of people in the society.