They left their two-month-old with me while they went shopping. But his desperate crying wouldn’t stop. I checked his diaper and what I found made my hands tremble. I grabbed him and rushed to the hospital.

I will never forget that Saturday afternoon in Madrid.

My son and daughter-in-law had asked me to watch their two-month-old baby while they ran a few errands. I accepted with joy—after all, I had been waiting for any chance to spend time with my first grandchild. When they arrived, the little one was fast asleep in his stroller, wrapped snugly …