little brother a younger brother; "my little brother just had his 50th birthday"
brother -
a male person who is a fellow member (of a fraternity or religion or other group); "none of his brothers would betray him"
fellow member,
member an organization that is a member of another organization (especially a state that belongs to a group of nations); "the library was a member of the interlibrary loan association"; "Canada is a member of the United Nations"
religious belief,
religion,
faith a strong belief in a supernatural power or powers that control human destiny; "he lost his faith but not his morality"
Brother -
(Roman Catholic Church) a title given to a monk and used as form of address; "a Benedictine Brother"
monastic,
monk a male religious living in a cloister and devoting himself to contemplation and prayer and work