Is it legal for your parents to report your car as stolen if you for whatever reason do not come home before their set curfew?

If you are out with your friends and your parents call telling you that you have to be home by 12am or the police will be called and the car will be reported stolen. And you refuse to come home at this time (Even though you are 18 and have no legal curfew) is it legal for the parents to then call the police and report the car as “stolen”?