'Families' in the Bible

Saul answered and said, "[Am] I not a Benjaminite, from the smallest of the tribes of Israel, and my family the humblest of all the families of the tribes of Benjamin? Why do you speak to me {in this way}?"

Then he brought near the tribe of Benjamin according to its families, and the family of Matri was selected by lot. Then Saul the son of Kish was chosen, and they sought him, but he could not be found.