'Brother' in the Bible

Now Ahijah was carrying an ephod. He was the son of Ahitub, who was the brother of Ichabod and a son of Phineas, son of Eli, the priest of the Lord in Shiloh. The army was unaware that Jonathan had left.

When David's oldest brother Eliab heard him speaking to the men, he became angry with David and said, "Why have you come down here? To whom did you entrust those few sheep in the desert? I am familiar with your pride and deceit! You have come down here to watch the battle!"

He said, 'Permit me to go, for we are having a family sacrifice in the city, and my brother urged me to be there. So now, if I have found favor with you, let me go to see my brothers.' For that reason he has not come to the king's table."

Then you will say to my brother, "Peace to you and your house! Peace to all that is yours!

David said to Ahimelech the Hittite and Abishai son of Zeruiah, Joab's brother, "Who will go down with me to Saul in the camp?" Abishai replied, "I will go down with you."