If the other party does not pay compensation, the current method can only sue the other party and his insurance company (if the other party's vehicle is insured), but be prepared to fight for several months! Besides, your father's treatment cannot be interrupted. You can only pay for the treatment yourself first, and keep the medical documents for future prosecution or additional compensation!

In addition, you can apply for a road traffic accident rescue fund first! But this money is usually used to advance rescue expenses and funeral expenses. If the other party has compulsory insurance, this fund is used to advance the part exceeding the compulsory insurance limit, which means you can ask the other party to solve some expenses with compulsory insurance first! In addition, this fund is used to protect the injured party in accidents such as the escape of unknown motor vehicles or drivers. It is possible that you will have trouble applying, but you might as well try!

I hope I can help you. Good luck!