Recently, we took our twenty-two-month-old granddaughter, Moriah, overnight for the first time without her older brothers. We lavished lots of loving, undivided attention on her, and had fun doing the things she likes to do. The next day after dropping her off, we said our goodbyes and headed out the door. As we did, without a word Moriah grabbed her overnight bag (still sitting by the door) and began following us.

The picture is etched in my memory: Moriah in her diaper and mismatched sandals ready to depart with Grandma and Grandpa again. Every time I think of it, I smile.…