These were the Levite family groups: the Libnite clan, the Hebronite clan, the Mahlite clan, the Mushite clan, and the Korahite clan. Kohath was the ancestor of Amram.
Jahath was the first and Zizah was the second; however, Jeush and Beriah did not have many sons, so they became one family and received a single assignment.
Amram’s sons: Aaron and Moses. Aaron, along with his descendants, was set apart for ever to consecrate the most holy things, to burn incense in the presence of the Lord, to minister to him, and to pronounce blessings in his name for ever.