No, you don't have a right to fight for it unles you were actually NOW given some property image in it--e.g. you have a remainder interest, so that it is already determined that your brother gets to live there for his life, then it passes to you; or you have some partial ownership interest (e.g. are a coowner). If you have one of these interests, you *may* have the right to take legal action to preserve the home. On the other hand, if it was merely that your mother's will said that if your brother would die before she died, then you would be the one to get the house, then you have no right to take action--it's his home. So the question is whether you at present have some enforceable interest, and if in doubt, you should consult with an attorney. Good luck.