My sisters refuse to give me a copy of my parents' will for 2 years already, what can I do?

If your parents are deceased, and the sister has the original will AND she's refusing to probate it, you can file an action in probate court forcing them to deliver the original wills to the court clerk. If you can't afford to pay a lawyer to do it, you might check with a local law school and see if a legal clinic or law professor can assign a student attorney to do it for you.