Can sons be permanently excluded from maternal property in legal suits

Two Sons of a Divorced mother who are living and custody with father are given petition to District Court for include their names (as a shareholder) in Civil Suit as well as in CMA suits for the property of Late maternal grandfather and great-grandfather (Both Expired) for undivided ancestral and self-acquired agricultural land and their divorced mother is alive. What is the provision in law to reject and debar them from this property? They applied before their mother applies for substitute her name into the suits. Is there any legal process for permanent exclusion of sons from maternal properties?