'Brother' in the Bible

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

Now Miriam and Aaron spoke against Moses because of the Cushite woman whom he had married (for he had married a Cushite woman);

“Take the rod; and you and your brother Aaron assemble the congregation and speak to the rock in front of them, so that it will pour out its water. In this way you shall bring water for them out of the rock and let the congregation and their livestock drink [fresh water].”

When you have seen it, you too will be gathered to your people [in death], just as Aaron your brother was gathered;

and they said, “The Lord commanded my lord [Moses] 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.