'Brother' in the Bible

And when they were come into the city, they went up to the upper chamber, where were staying both Peter, and John, and James, and Andrew, Philip and Thomas, Bartholomew and Matthew, James son of Alphaeus, and Simon the zealot, and Jude the brother of James.

And Ananias went and entered into the house; and laying his hands upon him he said, Saul, brother, the Lord has sent me, Jesus that appeared to thee in the way in which thou camest, that thou mightest see, and be filled with the Holy Spirit.

and slew James, the brother of John, with the sword.

And they having heard it glorified God, and said to him, Thou seest, brother, how many myriads there are of the Jews who have believed, and all are zealous of the law.

coming to me and standing by me, said to me, Brother Saul, receive thy sight. And I, in the same hour, received my sight and saw him.