Most rules can, and should, be discussed within a family. In many homes, a rule not up for discussion is that there are no rewards for crying. For example, your child really wants something, and it is refused. Then, your child starts to cry, often very dramatically. As soon as the tears start, the child gives up any negotiating power. Calmly saying, "I'm sorry, we can't even discuss this now," will quickly take the steam out of the crying tactic.