My parents jointly owned a flat in Mumbai and had nominated me and my brother in equal ratio. Both my parents passed away and according nomination registered with the co-opertive society, they have transferred the shares in joint name of me and my brother. Do I need to also get the agreement of ownership of flat [sales deed with which the flat was purchase by my parents] changed to me and my brother's name? Would it be considered as a new registration? Do we need to pay the stamp-duty?