My brother knew this woman only casually . She was not a girlfriend in the traditional sense . My brother suffered from brain cancer . After my brother's third operation to remove the tumor , my father died and I was named the executor of his estate . I attempted to get the estate settled as soon as possible but my brother became impatient and hired his own lawyer . Previously , we had used the same lawyer to assist us , the only beneficiaries , to in dividing the estate . At the same time as he hired his own lawyer , he dropped me as his power of attorney and health care proxy and installed the same friend in these roles . He also had a will drawn up in which he left 70% of his assets to his same friend and her relatives . What are my percent chances of successfully challenging his will in court ?