My unmarried uncle and my father (younger brother of my uncle) jointly own an inherited house in Varanasi without any demarcation and pay taxes. My uncle has gifted to the caretaker (not related to our family bloodline) through registered will his undivided fifty percent share without informing my father, we came to know recently. Both my uncle and father are aged (81 and 72 yrs) Please advise if my father can sell his undivided share to third party, we have interested buyer.