I was wanting to know how difficult it is to show negligence of a parent in a civil suit..?

I was attacked at a friends house that is owned by his visually impaired father. The man who attacked me is the homeowners son, and he is also visually impaired in one eye and suffers from brain damage and a substance abuse problem. The night he attacked me, we were both drinking, and he was drinking and doing other drugs on top of his medication for brain injuries. His father has allowed him to be care-taker of his house, and I find this highly negligent of the father to allow his son who is suffering from all of these problems to be care-taker of a house for a visually impaired man. In testimony, the doctors who evaluated the son said the son had no control over his rage once it began, stating he was not responsible in his mind for his actions and that the ault was not intentional. He plead guilty in criminal courts to three counts and was sentenced to a dual-diagnosis treatment facility for both mental and substance treatment. Do I have a suitable case to proceed in a civil trial against the insurance policy of the father holding him negligent for allowing his son to be care-taker of his house?