It\u2019s so easy to make threats as a dad. If you don\u2019t stop that, I\u2019m going to turn the TV off. If you don\u2019t start being nicer to your brother, we\u2019re going to go home. You have to pick up your clothes first, or else there is no snack. You do it when they\u2019re little, and if you remember your own childhood, it keeps happening all the way through\u2014about curfew, about grades, about keeping their room clean, about how you talk to people. But while making threats is easy, keeping one\u2019s word...