17. The sons of Levi were Gershon, Kohath and Merari.
18. The major families from Gershon were Libni and Shimei.
19. The major families from Kohath were Amram, Izhar, Hebron and Uzziel.
20. The major families from Merari were Mahli and Mushi. Those were the major families of the Levites.