Hebrews 13:22–25 (ESV) 22 I appeal to you, brothers, bear with my word of exhortation, for I have written to you briefly. 23 You should know that our brother Timothy has been released, with whom I shall see you if he comes soon. 24 Greet all your leaders and all the saints.  Those who come from Italy send you greetings. 25 Grace be with all of you.

This letter is specifically written to the brothers.  Generally, this term was used to reflect those of same family. Thus, the NIV says brothers and sisters. The term means “Those of the same womb.” God reveals the depth of HIS truth to HIS church family. The Apostle has affection and confidence in the church family.