Transfer of propert through Gift Deed

My father had a 1 BHK flat in co operative society in Mumbai. After his death, the flat is transferred in the name of my mother as she was nominee. My father has 2 sons & 2 daughters. Now we all decided to transfer this flat in my name through GIFT DEED. Our property consultant says that the deed will be between my mother & me. And my 1 brother , 2 sisters will give NOC for the same. He says that name on the share certifiacate is mother's only But I said him to make GIFT DEED between (My mother, 1 brother, 2 sisters) & me. I am confused that how many doners will be in GIFT DEED 1 or 4