'Families' in the Bible

So in the lowest part of the space at the back of the walls, in the open places, I put the people by families, with their swords, their spears, and their bows.

And my God put it into my heart to get together the rulers and the chiefs and the people so that they might be listed by families. And I came across a record of the names of those who came up at the first, and in it I saw these words:

All these were the people who went up from Tel-melah, Tel-harsha, Cherub, Addon, and Immer; but because they had no knowledge of their fathers' families or offspring, it was not certain if they were Israelites:

They made search for their record among the lists of families, but their names were nowhere to be seen, so they were looked on as unclean and no longer priests.

And some of the heads of families gave money for the work. The Tirshatha gave into the store a thousand darics of gold, fifty basins, five hundred and thirty priests' robes.

And some of the heads of families gave into the store for the work twenty thousand darics of gold, and two thousand, two hundred pounds of silver.

And on the second day the heads of families of all the people and the priests and the Levites came together to Ezra the scribe, to give attention to the words of the law.

And we, the priests and the Levites and the people, made selection, by the decision of the Lord, of those who were to take the wood offering into the house of God, by families at the regular times, year by year, to be burned on the altar of the Lord our God, as it is recorded in the law;

And his brothers, heads of families, two hundred and forty-two; and Amashsai, the son of Azarel, the son of Ahzai, the son of Meshillemoth, the son of Immer,

And in the days of Joiakim there were priests, heads of families: of Seraiah, Meraiah; of Jeremiah, Hananiah;

The Levites in the days of Eliashib, Joiada, and Johanan, and Jaddua, were listed as heads of families; and the priests, when Darius the Persian was king.

The sons of Levi, heads of families, were recorded in the book of the histories, even till the days of Johanan, the son of Eliashib.