It also depends on how much you are open to your parents in some families more restrictions on the other hand in some families children are very much open to their parents . Firstly you should have to ask your self if you are 100 percent sure that you are right in what you are saying or asking your parents to do then go n talk to either your mother or your father first to whom you are more closer .If one of them understand then he or she will convince the other,Try it and tell we can discuss further,have a nice time.