See note.
Because those fat "riendeer" can't fly as well as the skinny ones.

They also come in red.
You are welcome.
J: "Don't let him play in the snow!" [Volume setting: Normal person.]
Me: "Whatever!' [Volume: thunderous earthshaking heavy breathing.]
J: "He'll get cold!" [Volume: Regular.]
Me: "Whatever!" [Volume: Waking the dead.]
J: "I am going to be useful and shovel the walk." [Volume: My wife is crazy.]
Me: "OH MY GOD, YOU ARE GETTING SNOW ON ME AND I AM MELTING." [Volume setting: Serious drama queen.]
J: "I am about ready to dump snow on your head." [Volume setting: Unspoken.]
PS We did not ALL get into the bathtub once inside, that would be weird.
PPS Ethan really does think he is King Of The World, Ya People. It is an only child thing.