This relates to the contest because without Rudolph, Christmas wouldn't happen, so I made his child (uh... weird a bit?!) Rudolphetta has a shiny nose too, so she also guides the sleigh with her father :)
Oopsies, it got disqualified :/

It all started 1,000 years ago...

"Ho ho ho!" Santa Claus exclaimed. "Where's Rudolph gone?"
A figure emerged from the darkness. "Santa Claus? Is that you?" a voice said.
"Who's there? Is that you Rudolph?"
"Yes," the figure showed herself. "I'm Rudolphetta. Rudolph has been kidnapped!"
"Rudolphetta? Who are you?" Santa Claus asked.
"Rudolph's half human daughter. A cloaked person came into our stables and stole Rudolph! I didn't know what to do, so I came here."
"We must go and find him! Without Rudolph, I can't see!" Santa Claus said.
"My nose lights up like my father's, I can tell where he is if he lights up his. He knows when I light up mine, so it will be like a signal to him."
Santa Claus and Rudolphetta went to save Rudolph. They had to go to a lair, but who's?
A few minutes later, they found Rudolph locked up.
"Santa! Rudolphetta! H-h-h- he's.. He's here!" Rudolph stammered.
"Who?" Santa asked.
"H-h- Herobrine!!"
"So you captured my father! Herobrine, SHOW YOURSELF!!!" Rudolphetta exclaimed.
"NO RUDOLPHETTA!" Santa and Rudolph screamed.
Herobrine emerged from the darkness. There was a duel between Rudolphetta. Suddenly, Herobrine fell to the ground, clutching his chest.
"Help me... heeeeeelp meeeeeeeeeeeeeeeeeeeeeeee..." he whispered.
"What's happening?!" Rudolphetta cried.
"I'm being turned... GOOD!" Herobrine stuttered.
The magic in Rudolphetta had created something amazing. Herobrine was split into two people - a good one, and a bad one. Herobrine remained in pain, and required immediate assistance. If he didn't, he would die.
"We can't just let him die! He might be evil, but it's Christmas! Where's the Magic of Christmas when you need it?" Rudolphetta said, whilst looking after Herobrine. They took him back to Santa's Workshop and the elves looked after him until he was well enough.
Rumour has it that at Christmas, Herobrine celebrates with the unholy creatures of the Netherworld.

To this day, Rudolphetta and the other reindeer still keep in touch with Herobrine at Christmas (even though he is evil, he loves Christmas, and doesn't like being on the naughty list!)