'Brother' in the Bible

Paul, an apostle of Jesus Christ by the will of God, and Timotheus our brother,

Being gentle to one another and having forgiveness for one another, if anyone has done wrong to his brother, even as the Lord had forgiveness for you:

All my state shall Tychicus declare unto you, who is a beloved brother, and a faithful minister and fellowservant in the Lord:

With Onesimus, a faithful and beloved brother, who is one of you. They shall make known unto you all things which are done here.

Aristarchus, my brother-prisoner, sends his love to you, and Mark, a relation of Barnabas (about whom you have been given orders: if he comes to you, be kind to him),

And Jesus, whose other name is Justus; these are of the circumcision: they are my only brother-workers for the kingdom of God, who have been a comfort to me.