What to do if some flat owners are amending Deed of Declaration

My late father had granted half of our plot 8000 sq.ft to a Builder in 1988 and 2400 sq.ft FSI of our remaining plot to the Builder to construct 10 flats. We have 1600 sq.ft building plus 2400 sq.ft open land in our possession. This is as per the Deed of Declaration. There is a partition wall between the two portions of the plot. The ten flat owners have amended the Deed in order to get the possession of vacant land to redevelop their building.I am opposing their proposal, how can I protect my stand? I have filed a Civil Suit and optained Temporary Ingention.