Whose and who’s may sound the same, but they have different meanings. Whose is the possessive form of who, as in “Whose turn is it?” or “the woman whose name I can’t recall.” Who’s is a contraction of the words who and is (as in “Who’s coming with me to meet Dave tonight?”) or of the words who and has (as in “He’s someone who’s always looked on the bright side”).
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Who's is a contraction of "who is," as in "who's there? and "the friend who’s calling," or of "who has," as in "who's got the time?" and "the friend who’s helped before."
Who's and whose are easy to confuse. Who's means who is or who has. Whose shows possession (e.g., Never trust a doctor whose plants have died).