My 18 year old daughter and four friends drove to South Carolina (we are in Pennsylvania), using one of the friend's car (in her father's name). My daughter was at a drive-thru window and the vehicle behind her hit them causing a very small scratch on the bumper. The police were called and said that they could not determine fault (the other driver said my daughter backed up) because it was his word against hers. The father wants us to pay for the damages; however, my daughter offered insurance information at the time of the accident and the police told her it wasn't necessary because in South Carolina the OWNER is liable, and in this case each for their own vehicle. Who is responsible for the damages?