1, it depends on what charges your family is suspected of. The crime of causing traffic accidents, because two people died, bears full responsibility or main responsibility, which belongs to bad circumstances and should be sentenced to 3-7 years. If it is defined as the crime of negligent death, it should be sentenced to 3-7 years because of the serious circumstances.
2. Because your family members are performing their duties, the employer or the employing unit or the unit where the labor relations are located shall bear all the liability for compensation.
Civil compensation needs to be determined according to your local actual situation. You must consult your local lawyer.