I Kings 20:32-34 [20:32] So they girded sackcloth on their loins, and put ropes on their heads, and came to the king of Israel, and said, Thy servant Ben-hadad saith, I pray thee, let me live. And he said, Is he yet alive? he is my brother . [20:33] Now the men did diligently observe whether any thing would come from him, and did hastily catch it: and they said, Thy brother Ben-hadad . Then he said, Go ye, bring him. Then Benhadad came forth to him; and he caused him to come up into the chariot. [20:34] And Ben-hadad said unto him, The cities, which my father took from thy father , I will restore; and thou shalt make streets for thee in Damascus, as my father made in Samaria. Then said Ahab, I will send thee away with this covenant. So he made a covenant with him, and sent him away. (Perhaps Ahab & Ben-hadad had the same mother)
Comment For other brothers (relatives), please see the section on SIBLINGS