Car accident .. Please help !?

You need to take him to the hospital. Sometimes everything can look okay outward in a person but the injury inward might be very sever. The person who hit you in the back is the one responsible for paying your cousin hospital bill. So try to take your cousin to the hospital so that he can be properly examined. Don't wait to long. In the morning get a copy of the accident report so you can contact the other person insurance so they can pay your cousins hospital bill. If they refuse and give you a hard time about paying the bill tell them you are going to get an attorney to make sure he takes them to court to pay the hospital bill because it was their clients fault who hit you from behind. I Think this will get them moving to pay the bill because they don't want any lawsuits.