Numbers 4:15

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

Numbers 4:24

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

Numbers 4:27

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

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