'Brother' in the Bible

Paul, called to be an apostle of Jesus Christ through the will of God, and our brother Sosthenes,

But as it is, I wrote to you not to associate with anyone who is called a brother who is a sexual sinner, or covetous, or an idolater, or a slanderer, or a drunkard, or an extortioner. Don't even eat with such a person.

But brother goes to law with brother, and that before unbelievers!

But to the rest I -- not the Lord -- say, if any brother has an unbelieving wife, and she is content to live with him, let him not leave her.

Yet if the unbeliever departs, let there be separation. The brother or the sister is not under bondage in such cases, but God has called us in peace.

And through your knowledge, he who is weak perishes, the brother for whose sake Christ died.

Therefore, if food causes my brother to stumble, I will eat no meat forevermore, that I don't cause my brother to stumble.

Now concerning Apollos, the brother, I strongly urged him to come to you with the brothers; and it was not at all his desire to come now; but he will come when he has an opportunity.