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Words that are pluralized in the middle?

I've heard it pronounced both ways:




While one may be more technically correct than the other, are they both equally acceptable based on popular usage?

marked as duplicate by kiamlaluno, Mitch, psmears, Dusty, Henry Jun 27 '11 at 23:46

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"Sons-in-law" is proper. Think of the hyphenated suffix "-in-law" as an adjective, which was its original purpose. It would be equivalent to "partners in crime".

  • Note that the -possessive- does follow the somewhat illogical 'add the 's' to the very end", e.g. "son-in-law's". – Mitch Feb 21 '12 at 17:57

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