Can a property Nominee sell of the property immediately after transfer

I and my father are Hindu and nominated by my Mother who passed away in 2016 for a flat. My Brother and Sister have no objection to sale of the flat. We have recently asked cooperative society to transfer the property to our names. We have a buyer for the flat and wish to sell of the flat immediately of transfer to our names. Society is quoting section 29 rule of 1 year wait. Since this is transfer by inheritance and nomination does this apply. Can I sell off the flat without 1 year wait? Is rule different for transmission of property. We do have a will in my favour but it is in registered and probate will take time so we are not using that path. All siblings and my father are prepared to sign where required.