Children are great teachers, if you listen to them. When I am tired and stressed, I am a useless parent. If my younger daughter, Bethany, marches into the living room and accuses her older sister of hitting her, I will call Natasha into the room, shout at her and send her to her room. Later, I will go to see her, explain that I was tired and stressed, and listen to what she has to say. If she's no...