Regarding layout plot if someone occupied

U issue legal notice to him and file suit for declaration.when it comes to Ur knowledge within three yrs u have to file declaration suit.throw stoneto tree fruit may fall or not.even if he claims adverse possession the law considers when it came to Ur knowledge. from that day onwards.

Not 30 years.  already 48 years completed.  what is the use for asking now?   In the year 1971 no question of plots.  It might have been a vacant site.  and there may be so many buyers/seller for the property.  However send a legal notice to the present owner by consulting a local lawyer.