Jahath was the first and Zizah was the second; but Jeush and Beriah did not have many sons, so they were counted as one family and received a single assignment.
KJV
And Jahath was the chief, and Zizah the second: but Jeush and Beriah had not many sons; therefore they were in one reckoning, according to [their] father’s house.
ASV
And Jahath was the chief, and Zizah the second: but Jeush and Beriah had not many sons; therefore they became a fathers’ house in one reckoning.