It's "commander-in-chief". "Who's" is "who is": - Do you know the man who's sitting near the bar? - Who's the man sitting near the bar?
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PieanneIs it a joke? "The commanders-in-chief's bedroom", I guess. Never used it that often.And I would hope that it is bedrooms.
VictoriaGuybut what's the plural possessive of "commander-in-chief"?Or 'of the commanders-in-chief'.