Dispute in property distribution

My uncle has filed a suite of partition against my father.Our family property was originally owned by my grandfather.The property as mentioned above was meant to be divided between my father my uncle and my grandmother.However my uncle has been eyeing my grandmother's share of land and is taking away my grandmothers part of land . The land is almost 9 kottah and was owned by my grand father . But my uncle has already done a registration for taking my grand mother's part of land without informing us.Sir,we would like to know that what steps can we take now in order to revoke this partition suite which has been filed against my father and how can we make sure that my grandmother's share of land is equally divided between my father and my uncle?Our religion is Hindu.