2. I suggest you explain the ownership relationship of the vehicle to the family of the deceased.
3. Compulsory insurance will bear part of the responsibility. If there is commercial insurance, the insurance company shall be liable for compensation within the insurance limit.
It is suggested to consult a lawyer face to face, which will definitely help you. Good luck!
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.