Hand in hand, my grandson and I skipped across the parking lot to find a special back-to-school outfit. A preschooler now, he was excited about everything, and I was determined to ignite his happiness into joy. I’d just seen a coffee mug with the inscription, “Grandmas are moms with lots of frosting.” Frosting equals fun, glitter, joy! My job description as his grandma, right?

That . . . and more. In his second letter to his spiritual son Timothy, Paul calls out his sincere faith—and then credits its lineage both to Timothy’s grandmother, Lois, and his mother, Eunice (2 Timothy 1:5).…