And of Kohath was the family of the Amramites, and the family of the Izeharites, and the family of the Hebronites, and the family of the Uzzielites: these are the families of the Kohathites.
The verse says that the Kohath group had four families: the Amramites, the Izeharites, the Hebronites, and the Uzzielites. These are all the families in the Kohath group.