Married daughter's right to claim ancestral property

My Grandmother purchased a property sometime in 1950's and before her death she maid a will stating, her husband will enjoy the property post her death and after his death her 2nd son (my father) will be the sole owner of the property. Basis the same, now the property is in my father's name. My Father expired in 1995 without making any will. Now, my mother, my sister (married) and myself (married) are alive. I would like to know post my mother's death, will I be the sole owner of the property or my sister can also claim share in it.