My little brother's medical cost

My 12 year old brother Tyler was hit by a truck Sunday evening. He is currently in Denver children hospital in critical condition with multiple skull fractures, the carteroid artery was damaged, liver and spleen lacerations, multiple verterbra injured in neck n back, 2 broken ribs, broken humerous and femur, and knee fractures down the calf, all on the left side, severe head trauma, lungs are bruised and lacerations all over legs and bruises. My sister amber and I are wanting to help my mom and his dad Ricky with any medical costs and any other financial costs while they navigate through this. Any amount would help and is greatly appreciated.