Well, firstly your grand father is alive, or not.
if not then
all four brothers name to be updated in the books of rights of records. or
all four brother can enter into registered agreement for determinig the land possessed by them.(i.e. distribution)
therefore the land say 4 part done A,B,C & D.
then one brother will have ownership on A land built building etc.
Q.is it that it is not possible to divide the land as if land is divided building cannot be constructed.
if yes, then any mutual agreement of understanding of ownership can do.