“Dad, what time is it?” my son asked from the back seat. “It’s 5:30.” I knew exactly what he’d say next. “No, it’s 5:28!” I watched his face light up. Gotcha! his beaming smile said. I felt delight too—the kind that comes from knowing your child the way only a parent can. Like any attentive parent, I know my children. I know how they’ll respond when I wake them up...