Mommy kissing Santa Claus, is about a father dressed up as Santa kissing his wife. The kid is worried because of course he doesn’t know that his father plays Santa every Christmas.
There are a couple of clinkers on this list, but most are fine and beautiful. Carol of the Bells? great song.
Good point about Mommy kissing Santa Claus. I used to love a song with a similar theme, “Santa Claus Looks Just Like Daddy.”
You’re right, the humor comes from the misunderstanding.