Numbers 3:27-32

"And of Kohath was the family of the Amramites, and the family of the Izharites, and the family of the Hebronites, and the family of the Uzzielites: these are the families of the Kohathites. According to the number of all the males, from a month old and upward, there were eight thousand and six hundred, keeping the charge of the sanctuary. The families of the sons of Kohath shall encamp on the side of the tabernacle southward. And the prince of the fathers' house of the families of the Kohathites shall be Elizaphan the son of Uzziel. And their charge shall be the ark, and the table, and the candlestick, and the altars, and the vessels of the sanctuary wherewith they minister, and the screen, and all the service thereof. And Eleazar the son of Aaron the priest shall be prince of the princes of the Levites, and have the oversight of them that keep the charge of the sanctuary."

Here of course, we have exactly the same presentation of the sons of Kohath as was given in the above paragraph for the sons of Gershon. In both, it is most evident that no complete genealogy of any kind is given for the period of time covering over four centuries from the entry into Egypt by Levi and his brother-sons of Jacob, the purpose here not being to give a complete genealogy, but only sufficient information to support the division of the Levites into the three predominant families mentioned in this chapter.