Registered settlement deed can be revoked?

My mother have 2 ancestral properties out of which 1 was divided among her sister by court settlement.I have an elder brother, 2 elder sisters.we brothers both live abroad. We both have been taking care of the whole family. I supported in buying 2 houses in Chennai as my mother told she will settle one of the ancestral property to me. I had registered those properties in her name. She said once my brother also settles, she will register the 1 ancestral property in my name & other in my brother name, rest 2 houses which I supported to buy in daughters name.But silently she registered the 2 houses which I bought to my sisters without information & one of the sister started living with her recently as my mom got sick, also she cleverly planned & got the settlement deed done in her name for the 2 ancestral properties .All these happened with out my knowledge. I have few bank transactions details for 1 & for initial buying I gave money in cash, so no proof.will there be any justice for me.