'Brothers' in the Bible

Adonijah sacrificed sheep, oxen, and fattened cattle near the stone of Zoheleth, which is next to En-rogel. He invited all his royal brothers and all the men of Judah, the servants of the king,

‘This is what the Lord says: You are not to march up and fight against your brothers, the Israelites. Each of you must return home, for I have done this.’”So they listened to what the Lord said and went back as He had told them.