gifted land

Dear Sir AOA
Sir, i want a legal suggestion
that, in the year 1989 some acres land had been gifted to my father through voluntary by my all relatives afterwards my father a got a registration of the said land and owned till yet.
my father has been expired in the year 2015, after the death of my father being his legal heir I tried to the transfer on my name but last two months ago my uncle and aunt have claimed that we are the inheritance of the said too so they filed a complaint to the Additional Commissioner against me.

sir, my question is that a gifted land is reclaimable, I mean are they also inheritance
plz reply me as urgent because there is a fixed date of hearing

thanx