If it is not the relative's property you really have no case to fight back with. He can be charged with theft. Period. He will probably get probation for it and have to do some community service. He returned the vehicle the same way he got it. So no harm no foul. But theft is theft. If he was supposed to just borrow it for a couple hours and then instead he returned it a week or so later then that is theft. Sucks but the cops really cant do much for him once it has been filed stolen. Who knows he might get lucky and get a cool judge and they dismiss the case for him returning it in good shape. Or on the flip side he might get a Judge who is having a bad dad and get max penalty. Best of luck to whom ever it is though. =)