If my uncle dies without a will, in PA, does all the wealth go to that one living brother or is it divided in three shares?

Scenario re: Intestate in PA. Have an uncle who has never been married and has no children. He had three brothers, including my father. My father and one of his brothers is deceased, so one brother is still living. Three shares, 1 to the living brother, 1 to the children of once deceased uncle, and 1 to the children of my father (the other brother).