A male sibling sharing a single parent, as distinguished from a full brother or brother-german, from a step-brother, or from a brother-like figure such as a blood brother.

Alternative spelling of half brother

plural of half-brother

plural of half brother

The half brother of one's spouse. / The husband of one's half-sibling. / The husband of the half-sibling of one's spouse.

plural of half brother-in-law