Can successor sell a property without transfer to him/her

Dear Sir, My father's uncle was unmarried when he died his elder brother and sister was alive. My father has a will regarding his uncle property. The court case is going on regarding this will. But mean while my father's aunt (Bua) sell his portion to my two uncles. While this property not transferred to any successor due to will of my father. How can able to sell my father's aunt while property not transferred to her? She is also not live in the portion which he sold. Please give me advice what can i do in this situation. How can dismiss the illegal registry which is doing by my father's aunt? Regards, Saurabh