Question

My mother who owned the mineral rights and received royalties to property in Wyoming passed away in January 2008. I am her daughter who has taken care of her for the past twelve years. She had a will, but there was only one witness signature. She had no idea you needed 2. The problem I have now is her estate is in probate in Wyoming and I was informed that the estate is going to be split. They are going to give one third to my oldest brother, who had no contact with my mother for 30 years, and my middle brothers 4 children(who never had contact with my mother). Over the last 12 years I have had to quit a least 6 jobs just to take care of my mother. She kept telling me that I would be taken care of because she left the royalties to me. I don''t think it is fair that I gave up my life to take of my mother, and my brothers and their families did nothing. Is there anything I can do?