Last week Reuben said: "I hope I'll get lots and lots of presents." Mom and I knew we had a little explaining to do.
So we said, "On your birthday you get lots and lots of presents, because it's YOUR birthday. But Christmas is Jesus' birthday. We should give Him presents. We also get presents, but only smaller ones."
And that was it! He understood. "What presents do we give Him?" was the question a few days later. "Lots of love, obedience and a clean heart" is what we said. "I love Him already" was his answer.