Numbers 4:2-15

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

Kohath : son of Levi; founder of the clan of Kohath,the clan of Kohath

Levi : members of the tribe of Levi

Numbers 4:19-20

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