Lots of love and prayers to you and your family. This is a difficult situation. However, you need to stay strong. I think the idea of youtube isn't bad at all. Add hive to the mix and hopefully you will find some financial help.
At his age the best solution is BMT, it is really suitable since he has siblings that may fill the criteria. The prognosis is really good (above 90%) with proper treatment. He will have to be on transfusions. Hopefully he will be stable and lead a fruitful and happy life.
I am reposting this and sending a humble 5 hive as a tip. Please accept it as a token of my prayers.