How do I/what forms are needed to clear title of heirs?

My step-father and mother owned a house. My mother ped away and my sister and I are listed as heirs. I am in the process of buying the house from my step-father at a price that does not warrant any claim to rights that I may have (good deal). I have to take my mother's name from the title (have talked with sister) in order for me to finance the house as a purchase. Otherwise, I have a claim to the house, which makes it a re-fi. Will a quit-claim deed work, or do I need something else?