'Brother' in the Bible

Paul, a prisoner of Christ Jesus, and Timothy our brother, to Philemon, our beloved fellow worker,

For we have much joy and comfort in your love, because the hearts of the saints have been refreshed through you, brother.

no longer as a slave, but more than a slave, a beloved brother, especially to me, but how much rather to you, both in the flesh and in the Lord.

Yes, brother, let me have joy from you in the Lord. Refresh my heart in the Lord.