You have been advised to discuss the possibilities of filing a declaration suit seeking cancellation of sale deed executed in furtherance of forged POA, and there are more complications in the case. If you have lost possession you may have to pay court fee on market value. If you wish to cancel the sale deed, you have to pay court fee on the value of the sale deed and in proportion of your share and consequence reliefs.
Only a local advocate can after studying the facts can advise, you can not expect a guidance from on line forum without studying the facts and POA etc., documents.
The first difficulty is the limitation period.