Definition of Brothers-in-law

For the musical group of this name, see The Brothers-in-Law.

A person's brother-in-law is his/her sister's husband, or spouse's brother.

There is some illegitimate debate over whether the husband of a person's sister-in-law is "brother-in-law" or "brother-in-law by marriage", however, most legal definitions indicate that a sibling through marriage is a "brother-in-law" or "sister-in-law". The fact that legal definitions define the term in this manner proves there is no doubt that a spouse of a person's spouse's sibling is in fact a brother-in-law or sister-in-law.

For the film and novel, see Brothers in Law.

The group was established in 1963 by four police officers in Windsor, Ontario (hence the name Brothers-in-Law). The group's repertoire consisted mainly of musical satire poking fun at the Canadian government, sex and censorship, the law, and consumer issues. They performed and recorded a mixture of original songs and adaptations of folk and stage tunes (particularly based on Gilbert and Sullivan).