Division of property

My property is ancestral property. My father died in estate. My father has given a well constructed house in posh area at abt 7 cents to my sister and it is registered to my sister by way of gift deed in the year 2010 By my mother . My property is where iam residing is 5 cents. My sister filed a suit for half from my share .My father died in 1997 andmy mother died in 2016. My sister filed a partition claiming in my property . Both are ancestral properties