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Because who’s and whose sound alike, they are easily confused. Writers mistakenly treat the contraction who’s as a possessive form because of the apostrophe s.
Note: Use the possessive whose not only for people but also for animals and even things, in order to avoid the awkward construction of which.
If you can substitute who is (or who has) in your sentence, then who’s is correct. In all other cases, use whose.
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