My son's car was parked while he was playing basketball when drunk driver hit his car from the back end (thank goodness he was not inside). The car is not considered totaled. He did not have a gap insurance. Car insurance only paid for market value of the car, which left a balance of a little over $4,000. My son is still currently paying out of his pocket for the balance of the car. Is there anything we can do to have the other party pay of remainder $4,000. that my son is out?