'Brother' in the Bible

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

But now I have written to you not to associate with any so-called brother, if he is a sexually immoral person or a greedy person or an idolater or an abusive person or a drunkard or a swindler--with such a person not even to eat.

But brother goes to court with brother, and this before unbelievers!

Now to the rest I say--not the Lord--if any brother has an unbelieving wife and she consents to live with him, he must not divorce her.

For the unbelieving husband is sanctified by his wife, and the unbelieving wife is sanctified by the brother, since otherwise your children are unclean, but now they are holy.

But if the unbeliever leaves, let him leave. The brother or the sister is not bound in such [cases]. But God has called us in peace.

For the one who is weak--the brother for whom Christ died--is destroyed by your knowledge.

Therefore, if food causes my brother to sin, I will never eat meat {forever}, in order that I may not cause my brother to sin.

Now concerning Apollos our brother, I urged him many [times] that he should come to you with the brothers, and he was not at all willing that he should come now, but he will come whenever he has [an] opportunity.