'Brothers' in the Bible

Then Abner called out to Joab, "Must the sword devour forever? Don't you realize that this will turn bitter in the end? When will you tell the people to turn aside from pursuing their brothers?"

Joab replied, "As surely as God lives, if you had not said this, it would have been morning before the people would have abandoned pursuit of their brothers!"

You are my brothers -- my very own flesh and blood! Why should you delay any further in bringing the king back?'

Then all the men of Israel began coming to the king. They asked the king, "Why did our brothers, the men of Judah, sneak the king away and help the king and his household cross the Jordan -- and not only him but all of David's men as well?"