A brother-in-law is one's sibling's husband, or one's spouse's brother. If broken into two degrees of separation, it is called a co-brother-in-law ^[1], such as one's spouse's sibling's husband.^[2][3][4][5] The plural of this term is "brothers-in-law".

Examples:

• (Opposite-sex marriage): Joe and Brenda are married. Brenda has a sister, Irene, and so Joe is Irene's brother-in-law. Irene will marry Jason, who will then become Brenda's brother-in-law. Joe and Jason are also brothers-in-law.
• (Same-sex marriage): Richard and William are married. Richard has a brother, Matthew, and so William is Matthew's brother-in-law.

[edit] See also

• Affinity (law)
• Brothers in Law, a British comedy film
• Sister-in-law
• The Brothers-in-Law, a Canadian musical group

[edit] References

[edit] External links

• The Wiktionary definition of brother-in-law

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