'Brethren' in the Bible

Whenever any dispute comes to you from your brethren who live in their cities, between blood and blood, between law and commandment, statutes and ordinances, you shall warn them so that they may not be guilty before the Lord, and wrath may not come on you and your brethren. Thus you shall do and you will not be guilty.

The sons of Israel carried away captive of their brethren 200,000 women, sons and daughters; and they took also a great deal of spoil from them, and brought the spoil to Samaria.

Moreover, stand in the holy place according to the sections of the fathers’ households of your brethren the lay people, and according to the Levites, by division of a father’s household.

Now slaughter the Passover animals, sanctify yourselves and prepare for your brethren to do according to the word of the Lord by Moses.”

The singers, the sons of Asaph, were also at their stations according to the command of David, Asaph, Heman, and Jeduthun the king’s seer; and the gatekeepers at each gate did not have to depart from their service, because the Levites their brethren prepared for them.