A brother by blood: a brother-german or half-brother, as distinguished from step-brothers.
An unrelated male considered to share such a strong relationship generally.
An unrelated male considered to share a brother-like relationship established by a ceremonial sharing of blood in some cultures.
The brother of the spouse of one's sibling.
The brother of one's spouse.
The husband of the sibling of one's spouse.
The husband of one's sibling.