My son Adrian Miller and his wife Caroline had only been parents for two months, and like most new parents, they looked exhausted all the time. Caroline had dark circles under her eyes, and Adrian barely smiled the way he used to, but they still seemed deeply happy and proud of their baby boy, Ethan.

That Saturday morning, they asked me for a small favor while putting on their coats in the hallway of their quiet suburban home in Ohio.

“Mom, can you watch Ethan for an hour or two while we go to the mall,” Adrian said, sounding hopeful but worn out.

“Of course,” I replied immediately, stepping forward to take my grandson into my arms as Caroline gently kissed his forehead and handed him to me.

The moment the front door closed behind them, the house fell quiet, and then Ethan began to cry in a way that instantly unsettled me.

At first, it sounded like normal fussiness, so I rocked him slowly and hummed an old lullaby I used to sing when Adrian was a baby, but something about the rhythm of his cries felt wrong in a way I could not ignore.