What your aunt buys you car can you go on your parent insurance?

This isn't really enough information to answer your questions. If you still living with your parents and are under 18 the vehicle really needs to be titled in your parents name and then it can be insured in their name as well with you are the driver. If under 18 you are not an adult and cannot sign legal contracts. Have your parents contact your insurance company for their recommendation as well. Most companies want you to have your own insurance if you are an adult and have the vehicle titled in your name only. The problem is that you still must be listed on each others insurance policies as drivers if you live in the same household.