He should get a lawyer. I assume that he has insurance so if that is the case the insurance company normally will provide a defense.
This is not a workers compensation question, but more of a personal injury issue so I will change your category to get some other answers from personal injury attys in Calif.
I would talk to a personal injury attorney there in Glenwood. call Don Kaufman and he will help or give you names. The family probably has insurance that might cover the judgement so a good attorney wil be able to advise you on the benefits/risks or going forward.
The insurance company for the driver that is sued is responsible for providing a defense and covering damages or settlement of the case up to the policy limits of liability. If the driver of the vehicle that caused the accident was negligent and the damage award exceeds the insurance policy amounts then the driver can be personally liable. In reality it is rare that an attorney representing the injured party or estate, will pursue the individual because damages are difficult to collect and may...
Settlement in Colorado is based on a number of factors that usually have to do with what the insurance company thinks they will have to pay. I would urge you to talk to a workers compensation atty to have them evaluate your case. I can give you the name of someone there or discuss it with you if you want.