Permission from a parent does not override the law. If someone that doesnt approve of the age difference gets a bug up their butt and decides to let the authorities know then yes, if the age of maturity or consent in your state is 18 and over, you are in a heap of trouble. Call the local court house where you live and ask them the ask of consent or maturity and you will know your next move. You have to be careful about this! There is nothing wrong with dating. The age of consent is 16 in many states, but some it is 17 and even 18. But if it goes beyond that, there could be issues. The mother could get in trouble for endangering a minor.