Numbers 4:41

Aaron : a son of Amram; brother of Moses,son of Amram (Kohath Levi); patriarch of Israel's priests,the clan or priestly line founded by Aaron

Gershon : the clan of Gershom/Gershon of the tribe of Levi

Moses : a son of Amram; the Levite who led Israel out of Egypt and gave them The Law of Moses,a Levite who led Israel out of Egypt and gave them the law