My grand father earned land was taken from my father without family knowing

Dear Sir/ Madam,

We had a land about 3.69 acres. That was earned by my grand father. In my village one person steal it, I mean he converted on his name by giving 30k as my father was addicted to drinking. All my family members unaware about this matter. Once we have realized that land got converted to that person name with my family knowledge. Can i get justice in this matter. We are belongs to Scheduled caste.

regards
prasad