Transfer Of Share Under Joint Ownership Of Flat

Transfer of share in joint ownership of the flat I and my mother own flat in housing society under a joint ownership basis. My mother has done nomination in my name and a registered will for transfer of her share in my name. In that registered will it is clearly mentioned that share of the property should be transferred in my name and rest of her all belongings, like gold, ornaments and bank accounts will be given to my elder brother. Now my mother and father are no more, how I proceed in society for transfer of her share in my name.