I'm from Bihar, my grand father purchased a property of 95 decimile on my father's name in Mar, 1996. The land given under my possession[since 1996] is having a plot no. 123 (say)-Good Land. But the plot registered in my documentation is a different one [Plot No.456 (say)]-Bad Land. None of my family head checked the documents from that time till date.[Both of my Grand Father & Father died in Sept,2011]. I did my college in 2013 and I am working in Kolkata thus I did not check the property details as i beleived/trusted that the documents will be correct as all "rashid" etc was taken from 1996 and never got any objection from anyone and everyone in my village knows that land belongs to me. The Land Owner from whom the land was bought is the owner of both the Plots (123 & 456). Now, in Sept, 2015 the land owner sold the plot 123 to some other person even though he knew that he has given the Plot 123 to me and he had done wrong registry. The plot 123 is still in my possession but the 3rd party is now trying to get possession.
So please please help me understand the legality of how i would get the Plot 123?