LAND GIFT DEED CHALLENGED AFTER 10 YEARS.

My Uncle had sold an agriculture land to my father in the year 2008. The transaction type was a gift deed. My father had paid the required amount, paid stamp duty & has got the land under his name on 7/12 extract. Now, my father wants to sell the land but my uncle almost after 10-12 years has filed a suit in district court. The reason being, he demanded half money once sold, we denied and later he filed a case against us. Now, presumably, my uncle has understood he is going to lose the case. Therefore, he has now forced his daughter to come on podium, she stated 'My father had sold the land without her concern, therefore I seek some money from out of it'. Correct me if I'm wrong, but her daughter should've challenged his father and not mine right. Kindly suggest what's need to be done & what can happen in such case. Will my father will the case. Thanks & regards, Krishna Pawar