Talk with your non JW aunt and make sure you are on the same page, just in case.
I don't know if you should tell your parents. Please think about it some more. But the first thing you should do is make SURE you have somewhere to go if the worst happens.
I am so sorry for both you and your parents, who are subject to a terrible organization telling them how to think and how to feel, that only cares about its own power, no matter what it does to families.