'Brotherly' in the Bible

Be devoted to one another with [authentic] brotherly affection [as members of one family], give preference to one another in honor;

Now concerning brotherly love, you have no need for anyone to write you, for you have been [personally] taught by God to love one another [that is, to have an unselfish concern for others and to do things for their benefit].

Be hospitable to one another without complaint.

and in your godliness, brotherly affection, and in your brotherly affection, [develop Christian] love [that is, learn to unselfishly seek the best for others and to do things for their benefit].