Transfer of property in the name of legal heir

Hello, My grandparents resided in a bunglow in a co-operative hsg society along with my parents. Now both my grandparents are no more. According to the "will" made by my grandfather, after his death & my grandmothers death, the said property will go to his son & daughter-in-law (i.e both my parents). My father went to the tehsildar & circle office in our city where the property is located, after doing rounds and rounds of both these offices, the ppl there are not letting the property transfer in my parents name. According to their procedure, they have to take the written consent of my fathers siblings even if there is a "will" made. My fathers sisters have given their consent but my fathers brother who has no right in the mentioned property according to my grandfathers "will" is creating problems by not coming to the tehsildar/talathi office, by making these govt officials wait for hours. And the officers there say that as per the procedure my father's brother need to be given a chance to put forth his say and he has already been given several chances. Why do we have to follow such procedure if a "will" is already made in which he is disowned from the said property? Why are these govt officials not letting the property transferred in my parents name? Plz guide me with a solution. My father is doing rounds of these offices since the month of April 2018. Plz help