Stupid Christmas Carols - I saw mommy kissing Santa Claus

Wow! Mommy's kissing Santa Claus!
I saw Mommy kissing Santa Claus
Underneath the mistletoe last night
She didn't see me creep
Down the stairs to have a peep
She thought that I was tucked up
In my bedroom, fast asleep

Then I saw Mommy tickle Santa Claus
Underneath his beard so snowy white
Oh, what a laugh it would have been
If Daddy had only seen
Mommy kissing Santa Claus last night

He saw Mommy kissing Santa Claus
I did! I really did see Mommy kissing Santa Claus
And I'm gonna tell my Dad

Then I saw Mommy tickle Santa Claus
Underneath his beard so snowy white
Oh, what a laugh it would have been
If Daddy had only seen
Mommy kissing Santa Claus last night

Oh, what a laugh it would have been
If Daddy had only seen
Mommy kissing Santa Claus last night

I did! I did! I really did see Mommy kissing Santa Claus
You gotta believe me! You just gotta believe me!
Come on, fellas, believe me! You just gotta believe me!

     Okay does this song make sense to anybody? The song is sung by a child, who as he says crept down the stairs to try and see Santa, obviously we all know that Santa doesn't actually exist, so the person he saw, and thought was Santa must have been his father, but this begs the question, why would his dad dress up like Santa if he was going to put the gifts out when the son was sleeping??? If you're doing something behind somebody's back what's the point in dressing up like somebody else, you're not going to be seen doing it. Not only does it not make sense to dress up like Santa if you're not going to be seen, why would you buy a Santa costume for nobody to see you wearing? Sounds like a waste of money to me.

    The second thing that make no sense is when the kid says, "Oh, what a laugh if would have been if daddy had only seen mommy kissing Santa Clause last night." Excuse me, what is funny about your mom cheating on your dad, or is something else meant by that. Is the kids saying it would be funny to see his dad beat up Santa and his mom? I was of the opinion that children usually dislike it when their parents fight.