Registered will

My mother has created a registered will in my name . I have 2 sisters with whom I don't have any good relationship. in the will my mother has mentioned the transfer of flat in my name . I have been supporting her for many years now ! None of my sister help or provide any assistance . They have no good relationship with me or my mother . Do I need a NOC from them to transfer the flat and will the society will ask for it . She has registered will done about 3 years ago . Please advice