Our little grandson waved goodbye, then turned back with a question. “Grandma, why do you stand on the porch and watch until we leave?” I smiled at him, finding his question “cute” because he’s so young. Seeing his concern, however, I tried to give a good answer. “Well, it’s a courtesy,” I told him. “If you’re my guest, watching until you leave shows I care.” He weighed my answer, but still looked perplexed. So, I told him the simple truth. “I watch,” I said, “because I love you. When I see your car drive away, I know you’re safely heading…