What will be my right on my grandfather's property

my grandfather(GR), who is 92 yrs old has a house in delhi which has 3 floors.he has 2 sons,my father and my uncle,who have 2 children each. i am married female.others are males.in 2012,my GR gave me the possession of 1st floor in the house and I live there with my spouse.my GR lives on ground floor and one of my uncle's son lives on 2nd floor.As per will of my GR,which he made abt.30 yrs back,the house is to go to my grandmom after his death and then to his 2 sons,half each.my GR wants to give house to his 4 grandchildren, but my father and uncle do not want.what is my right after GR death.