Both who’s and whose are pronounced the same way but they have different meanings.
Who’s = who is or who has
Who’s this? or Who is this? No difference in meaning
Who’s coming with us? or Who is coming with us? No difference in meaning
Who’s that man? or Who is that man? No difference in meaning
Whose = show’s possession or ownership of something
Whose car is parked outside my house? Someone owns the car.
Whose book is in my bag? Someone owns the bag.
I met a man whose kids study in another city? The man owns the kids.
The trick to know and remember is that if you can’t rewrite the sentence by replacing the word with who is or who has then use who’s. If you can’t then use whose.
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