land possession ( more than 70 years )

We have own land with house and small temple ( family devotee) more than 70 years but land have no documents (13.5 cents) recently only we know this land don't have documents after my father expiry we have same size (13.5 cents ) land in direct opposite side one channel and road divided both lands ,that land have documents in name of my father but current living house land dont have any documents ,recently 2017 we are add my father name in patta and now we paid land tax , how to get own