Adverse Possession - Agriculture Land

There is an agriculture land which was in my father name. All land except one small piece of the land was sold to Mr. X. That small piece is still in my father name. But in jamabandi there is entry of 'Bila lagan bawajah bai' and Mr. X is named as kashtkaar. So, he is claiming for adverse possession. Can he claim adverse possession? What is our right on the property in this case?