Please help my brother Aaron get his next surgery

This is my nine-year-old brother Aaron and my best friend. He was born with a facial difference called Crouzon Syndrome and has gone through four surgeries already. He needs another surgery by the end of the year. It's been hard on my mom and dad because even though they have insurance, the surgeon is requiring $5,500 to schedule the surgery and another $5,500 seven days before the surgery. As of now, his surgery is scheduled for Nov. 13 but it can't happen until my parents pay another $5,500. Can you please help us? I really love him and I think he's one of the strongest and bravest kids I know. Thank you! Love, Aiden