Outside of a vandalism claim, auto insurance policies do not cover intentional damage caused to a vehicle. If you are actually the owner of the car then you may be able to claim that your son vandalized
it, but the decision to provide coverage for the damage will ultimately be up to your insurance company and repairs already made to the vehicle may or may not be reimbursed. If your son is the owner of the vehicle, though, it's even more unlikely that the damage will be covered at all. You can always contact your insurance company to inquire about how your policy applies in this situation, but the damage is probably not going to be covered.