Years ago, when our youngest son was 5, Seth asked during breakfast, “What day is it? Am I going to school today?” “Yes, it’s Tuesday,” my wife answered. An excited smile broke across Seth’s face. “Tuesday?! Today is sharing day!” I asked Seth what he was supposed to share. “Something that begins with the letter D,” he said. I grinned. “Well . . . you could bring . . . Daddy.” “No,” Seth replied matter-of-factly, “you wouldn’t fit in my cubby.”