1)your great grandmother bequeathed house to your father as per her will
2) on basis of will property has been mutated in your father name
3) please clarify whether notice was issued to uncle before mutation done
4) whether probate obtained of the will
5) your uncle could not have given premises on rent without the consent of owner of house
6) your father should issue legal notice to tenant to vacate premises
7)if he refuses file suit for eviction against tenant