Status of second holder in Locker according to father's will

I( Second joint holder) and my late father (first holder) are joint holders in a locker in a bank.Anyone of us could operate it singly. My father was a neuro patient ( undergoing treatment ) for 3 years before his death ( in NOV. 2015 ) About 4 months before his death my brother gave a written application to the bank, on behalf of my fathe , bearing signature of my father and thumb impression of my father, saying that I should be prevented from operating the locker. After the death of my father I came to know that my brother has a will of my father made 3 months before his death , making him the owner of the locker, Previously in September 2002 my father had made a will making me owner of the locker and also all his immovables and movables along with the other things meentioned in the said will. The will with my brother made in 2015 has no mention of this will - or -neither saying that he has made a earlier will in 2002 is cancelled.What is  my legal status over the the Locker?