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"Caleb is not doing good at all," Caleb's grandfather Charles Moore told The Denver Post Monday afternoon. "The prognosis is not good at all. It's almost certain he's not going to make it."

If indeed Moore loses his fight, it will mark the first fatality in the 17-year history of the Winter X Games.

"Caleb is in critical condition and is being closely monitored," family spokeswoman Chelsea Lawson said Monday evening. "The Moores want to express their gratitude to all of Caleb's fans, friends and family

for their strong support and ask for continued prayers in the coming days. The family will not be making any other public statements for the time being. Thank you for respecting the family's privacy during this difficult time."

Moore was injured Thursday evening during the snowmobile freestyle contest. He under-rotated a back flip and dug the skis of his sled into the lip of the landing.

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