Legal query regarding sub division of family property

Sir,my father has been expired.They made a will but it is not registered.We are 4 brothers 2 are residing somewhere else.Except one brother rest have no any disputes.One sister and our mother alive.My mother and sister have transferred their parts in favour of me and got registered. We three brothers ready for JOINT VENTURE with the builder but one is not ready.We donot have PATTA of this plot. My question is that can this one brother stop us for JOINT VENTURE if yes what he can do legally.