If you have an unrestriced license and you are 17 do you need to be on your parents' insurance in order to drive their car?

Yes because anything couuld happen Assuming you are living in the same household as your parents the answer is yes. Insurance companies must charge an appropriate premium for the risk that they are assuming. There is most likely extra premium that needs to be paid since young drivers tend to have more accidents. An undisclosed operator in the household is a form of premium evasion and can be considered insurance fraud. This leads to increased premium for all drivers in state.