Will by wife for a property solely in her name but brought by husband

We are a Hindu family, and I am married for 30 years. I am having marital discord with my husband who despite being well off, is not ready to support me financially. I have two sons who are indifferent to my situation. My husband had purchased a property entirely from his resources but it is solely owned by me (it is NOT joint ownership). My husband has taken a bank loan in my name for the construction of the house and the papers are mortgaged in the bank. I dont want to sell the property and I dont want to divorce him.My question is - If I create a will in my brother's name that after my death the property go to his name, will it be valid? If my husband also creates a will in some other person's name for this property, then whose will would prevail?