Sister cancelled the settlement deed transferred in my name

I have got the properties of my father which are his self earned through a settlement deed. After that i have transferred house tax, eb, revenue records and everything to my name. After six months my sister got the settlement cancelled by a cancellation deed and got a settlement deed to her name for all properties. I have filed a case citing that unilateral cancellation of settlement deed is not permissible. Will i win the case or not.