Our brother— There are few, perhaps, who need be told, yet it may be convenient, once for all, to remark, that, in the Apostle's time, brother was the ordinary appellation which Christians used one to another. The brethren here mentioned seem to be Stephanas and those others who came with a message, or letter, to St. Paul from the church of Corinth, by whom he returned this epistle in answer. See Acts 11:26.
Related Commentaries of 1 Corinthians 16:12
1 Corinthians 16:12
12 As touching our brother Apollos, I greatly desired him to come unto you with the brethren: but his will was not at all to come at this time; but he will come when he shall have convenient time.