Secret Marriage and Taxes (Pennsylvania)?

Whether or not your father can claim you on a dependent is more reliant on whether you're living with him and how much support he's providing. But I find it hard to believe your family is too traditional to understand the need for a simple wedding now but will be perfectly fine with you moving in together without a ceremony first. (And if you do it before you have to file your FAFSA for senior year or get your health insurance through them, that will have an impact.) Start your independent, adult life off on the right note and have enough respect for both your family and your own future to be open about your plans. You can always have a big party to renew your vows later.