'Brother' in the Bible

for even his father, mother, brother, or sister he will not make himself unclean {by their death}, because the separation to his God [is] on his head.

"Take the staff and summon the community, you and Aaron your brother, and speak to the rock before their eyes, and it will give water. Bring out for them water from the rock, and let the community and their livestock drink."

From Kadesh Moses sent messengers to the king of Edom: "Thus your brother Israel has said, 'You know all the hardship that has found us;

When you see it, you will be gathered to your people, just as Aaron your brother was gathered,

And they said, "Yahweh commanded my lord to give the land by lot as an inheritance to the {Israelites}, and my lord was commanded by Yahweh to give the inheritance of Zelophehad our brother to his daughters.