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.
Jewish Publication Society of America Version (JPS1917) - 1 Chronicles 23:11 >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.