ASV

And the children of Reuben, Israel’s first-born, their generations, by their families, by their fathers’ houses, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;

KJV

And the children of Reuben, Israel’s eldest son, by their generations, after their families, by the house of their fathers, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;