Please send them a notice about handover the possession. Then you can file civil suit for possession and perpetual injunction.
But before please ask to lawyer about possession because you have other remedies too. You can contact me
As per your submission it reveals that this is a matter of possession of agriculture landed property
You can send legal notice through your advocate and can claim possession of agriculture landed property
Inspite of notice if possession of property not gien by your uncle then you can file suit for possession with perpetual injunction against your uncle before the Honourable civil court
For advise you can call me on mobile no 9359867870
Advocate IRFAN SHAIKH Latur Maharashtra