When Mags’s card failed at the checkout, mean strangers laughed at the old woman struggling with her baby granddaughter. Then a man’s voice cut through the noise. She turned, ready for more shame. But what came next changed her life in a surprising way. I’m 72 years old, and I never thought I’d raise a baby again at my age. Six months ago, my daughter Bea packed a bag while I made breakfast in the kitchen. I heard her steps on the stairs. When she came to the doorway holding her two-week-old daughter, I thought she was just taking the baby for a walk to get fresh air. But she put Bambi gently in her bassinet in the living room, tucking the blanket around her. “I’m going to clear my head, Mom,” she said quietly, kissing the baby’s forehead. “Okay, sweetheart,” I replied, stirring oatmeal on the stove. “Don’t stay out too long. It’s cold.” But she never came back. I didn’t see the folded note on the counter near the coffeepot until the next morning, when I cleaned up after another...