Something about yesterday opened the fragile trapdoor behind which I was unknowingly storing my true feelings about my oldest child starting high school in a month. His impending matriculation didn’t take me by surprise, of course. I was cheerfully applauding at his 8th grade step-up ceremony in June, purchased his summer reading book a few weeks ago, and currently read weekly emails from the high school principal. But something about yesterday revealed the tender pit in my stomach like earl...