brother in law
brother-in-law. The brother of one’s spouse or the husband of one’s sister. • The husband of one’s spouse’s sister is also sometimes considered a brother-in-law. Pl. brothers-in-law.
brother-in-law. The brother of one’s spouse or the husband of one’s sister. • The husband of one’s spouse’s sister is also sometimes considered a brother-in-law. Pl. brothers-in-law.