Will Nomination Issue

Hi, 10 years ago my parents was living with Mr. & Mrs. paintal and were serving them domestic help and services for last 10 years. Mr. & Mrs. Paintal was not having their children by their own so they had considered my mother as their daughter and she was taking care of them from last 10 years. I would like to tell Mrs. paintal was an american citizenship holder and was married to Mr. paintal who was an indian citizenship holder but they both were living in delhi together. By not having their children Mrs. paintal make bank will nominee in which Mrs paintal made my mother nominee of her all bank account after her demise. Now i had that same will with me but don't know how to proceed with that will to obtain those bank accounts. kindly help me out? If anyone interested or can help me out so kindly please contact me.