Right to father's property

Dear Members, Here,a minor girl lives with mother and her father lives separately for long.The father lives with his parents and doesn't provide for wife and daughter.Now, suddenly he dies.The daughter doesn't have any idea about the money and property made by her father as all documents are with her grandparents and uncles etc.Now,how and where does she approach for her right to father's property? Her father was a middle level bureaucrat with the state government. Please reply.