The subject of in-laws can be a sticky one. Just figuring out when to use the hyphen and when to lose it can drive a person wacky. Your sister in law might point out the proper hyphenation issues for in-law topics.
But, if you want to relate a story about multiple sisters in law, that’s how it goes. It’s not "sister in laws." The law part is singular, even when the sisters are multiples.
Don’t believe me? Go ask your brothers in law. Or, if you happen to have been married more than once, ask your fathers in law or your mothers in law.
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