'Brother' in the Bible

He shall not make himself unclean for his father or for his mother, for his brother or for his sister, when they die, because his separation to God is on his head.

“Take the rod; and you and your brother Aaron assemble the congregation and speak to the rock before their eyes, that it may yield its water. You shall thus bring forth water for them out of the rock and let the congregation and their beasts drink.”

From Kadesh Moses then sent messengers to the king of Edom: “Thus your brother Israel has said, ‘You know all the hardship that has befallen us;

When you have seen it, you too will be gathered to your people, as Aaron your brother was;

and they said, “The Lord commanded my lord to give the land by lot to the sons of Israel as an inheritance, and my lord was commanded by the Lord to give the inheritance of Zelophehad our brother to his daughters.