Omg. My dad told me a few years before he passed, and now i am saying it to you. I didnt believe or understand when he told me. Anyway he said, "dont let your mother and your brother screw you out of your inheritance." im sorry this is happening to you. Tell him the will is the will. Altho your poor dad isnt even gone yet and already your brother is acting like a twit. He really should shut up in case your dad changes his mind and makes things worse for him, is what i would tell him.