Phinehas is the grandson of a prophet who was the brother of who ?
Zimri (prince):  Phinehas, grandson of Aaron, killed them both by impaling them on a spear (Numbers 25:6-15). Aaron: Aaron (Hebrew: אַהֲרֹן‎ ; or ) is a prophet, high priest, and the brother of Moses in the Abrahamic religions (elder brother in the case of Judaism).
Moses