You can try on that thing but there is very less chances of getting anything ! If the guy is paying for all medical and car tottaled money you wil have no strong base to fight with him ! This kind of incident happens always in US , if they all run for suing it will busy traffic on court !  Last week i had same incident ! i hit a car with a family with 6 month kid. But the impact was not like yours , i just touched the bumber very slowly and what i did was pay 200 Cash on scene without cops and insurance and flee away ! I was lucky i guess !