Probably more than you are able to acheive on your own. You had professionals investigate your accident, treat you and defend the insurance company. Studies confirm, that with few exceptions, people such as yourself net less without an attorney than with a local and qualified attorney. Presumably, the insurance company has told you or lead you to believe you do not need an attorney. Ask yourself why. Good luck.
Do not speak with this facility. Contact a qualified personal injury attorney asap. Do not be intimidated by the "waiver". Waivers are not legal; in this circumstance. It is a ploy to try to intimidate you into believing that you cannot sue (or as I would say, protect your child). The fact that businesses are allowed to have people sign these rags is repugnant. All the best to you and your son.