1 Corinthians 15 - Where's grandpa?

One of our hospice nurses said the devotional from 1 Corinthians 15 ("What will we look like in heaven?") was particularly pertinent because her little girl had recently been in tears, missing her great grandpa.

It got me thinking... how do we explain the resurrection to little children? Especially if they were present for a graveside committal service? One can give a theological explanation for the sin of Adam and Eve bringing death into the world, and Jesus' resurrection being the solution, etc. But I fall back on that same passage:
"It is the same way with the resurrection of the dead. Our earthly bodies are planted in the ground when we die, but they will be raised to live forever." (1 Corinthians 15:42, New Living Translation, 2015)
"Our bodies now disappoint us, but when they are raised, they will be full of glory... we will SOMEDAY be like Christ..." (verses 43 & 49, NLT, 1996)

It was in first (or was it second?) grade, we all saved our half-pint milk cartons, filled them with potting soil, and planted a bean. It was a lesson in patience. We would rush to the classroom window sill every morning to see if our bean plant had erupted from the dirt. Eventually our waiting was rewarded. I still like watching for seeds to sprout--either in my garden, or in crop fields.

Of course, kids' next question (until we train them to no longer ask it) is, "Why?"
Why does grandpa have to stay in the ground so long? When can I see him again? Somehow, though, I think God gives simple metaphors that even children can grasp. The point is that planting seeds is about planting hope, and patiently waiting for hope to be fulfilled. (Romans 8:24-25)

Lord, Even as adults, we have a hard time understanding death and resurrection. Thank you for putting unfathomable things in terms even children can understand.  Teach us to be patient, even while we wait for Resurrection Day. Plant your truth in our hearts and bring it to maturity to bear fruit for Your glory. Amen.