I don't know where you live, but your state may have a fund to help Victims of Violent Crime. Your son has a closed head brain injury, and needs to be seen by a neurologist and probably have cognitive therapy, perhaps speech therapy, as he recovers. His minimal brain injury (MBI) is a serious thing, but the brain has an amazing ability to recover, especially with proper treatment. It takes time and the first two years are when most recovery occurs - but some healing will continue up to 5 years. If you have your own health insurance, get him into a good neurologist right away for evaluation and treatment.