As children of our Heavenly Father, all men and women are spiritually brothers and sisters. In the Church, male members and friends of the Church are often addressed as brothers.

When thou art converted, strengthen thy brethren, Luke 22: 32. He who loves not his brother abides in death, 1 Jn. 3: 10-17. Think of your brethren like unto yourselves, Jacob 2: 17. Let every man esteem his brother as himself, D&C 38: 24-25. Strengthen your brethren in all your conversations, D&C 108: 7.