Assuming your father was a resident of Arizona, you'll need to work with an attorney licensed in that state. In general terms, you father has the right to do what he wishes with the money he inherited. He may or may not have prepared a will. You need to check with the court in the area where he lived to see if a will was presented to the court. Given the passage of time, the ability to challenge a will may be somewhat difficult. The only way to determine your rights is to hire local counsel to examine the records and advise you.