About Release Deed

Can Release Deed (mentioned as “Kudumba Pothu Vidhuthalai Aavanam” ie.Family Common Release Deed) be cancelled? Or can such Release Deed be challenged for claim of equal Share. We are 6 children (3 Sons & 3 Daughters) for our Parents. Myself, Eldest Daughter. My Brothers got Release Deed from us (3 Sisters) for Ancestral Properties (Father’s Ancestral & Mother’s Ancestral) 4 years back with out mentioning any property details . We all the 3 sisters have signed the Release Deed (mentioned as “Kudumba Pothu Vidhuthalai Aavanam” ie.Family Common Release Deed) Document in favor of our Brothers. The Release Deed is written as we got consideration for release of rights over properties, But actually we were not given with any consideration for Release Deed. Now can we cancel the Release Deed or can we claim for Partition Equal Share? And May I know what is the legal Procedure for the same? Issues in this are: Our Mother has given Power of her Property to our Father (He died 8 months back). Now does she has rights of her .