'Brother' in the Bible

Paul, a prisoner of Christ Jesus, and Timotheus the brother, to Philemon our beloved and fellow-worker,

for we have much joy and comfort in thy love, because the bowels of the saints have been refreshed through thee, brother.

no more as a servant, but above a servant -- a brother beloved, especially to me, and how much more to thee, both in the flesh and in the Lord!

Yes, brother, may I have profit of thee in the Lord; refresh my bowels in the Lord;