'Families' in the Bible

Saul replied, “Am I not a Benjamite, of the smallest of the tribes of Israel? And is not my family the smallest of all the families of the tribe of Benjamin? Why then have you spoken this way to me [as if I were very important]?”

Then he brought the tribe of Benjamin near by their families, and the family of Matri was chosen by lot. And Saul the son of Kish was chosen by lot; but when they looked for him, he could not be found.