Jahath was the oldest and Zizah the second oldest. Jeush and Beriah did not have many sons, so they were considered one family with one responsibility.
The sons of Shimei: Jahath, Zina, Jeush, and Beriah. These were Shimei’s sons – four in all.
The sons of Kohath: Amram, Izhar, Hebron, and Uzziel – four in all.