Manai Hukum

sir mere uncle ne 2 sal pahele mujse kuch papers pe sign liye the aur aaj main meri khud ke naam ki land sale kar raha to mere uncle ne jahir pragatan through kaha hai ki iss survey no ki land pure family main hai aur main akela usko bech nahi sakata aur mere khud ke sign se maine court main manai hukum manga hai aise bata rahe hai.. hal hi ki wo land 15 saal se mere hi naam par hai aur wo third party se purchase ki hai wo family property nahi hai.. to muje kya karana chahiye.