Exchange deed

Two property A (house) and B (factory) has been acquired from ansisters by my grandfather having 8 hairs and his brother. The factory deed was made between my grand father and his brother. During the course of business a C (vacant land) has been purchased by my grandfather by giving amount to his elder son (grand father's name has not been mentioned in the document) and constructed a house from the joint family business. Then a partition has been made in A and B schedule of property by my grand father hiding C schedule of property not showing C schedule of property. A schedule of property has been acquired by my grand father and B schedule of property has been acquired by his brother. Later a dispute has been arrised between my grandfather and his brother. Then his brother needs the C schedule of property which is a newly constructed house. Then a exchange between my grandfather's elder son and my grandfather's brother has been took place I.e B and C exchanged to my grand father's brother and his elder son. Here my grandfathers name has not been mentioned in the document. Then two brothers business deed was came to an end and his elder son acquired the partner position. Later after the expiry of my grandfather my grandmother has came to the position of partner this deed was not registered. It is a joint family business till then. After the expiry of my grand mother my grandfather's 2nd son came to partner and it is also not registered. My question is. It is possible by the elder son who acquired B schedule of property by himself or it should be divided to 8legal hires of my grand father. We served notice and also filed case. What will be the move by them