Sometimes I come across "Which" being used for people.

I didn't get to see the twins very well. That's why I can't tell which is which.

Which of you ate the chocolate?

Which one is the culprit?

Which "you" is who? (I also didn't understand this sentence btw. I don't understand the grammar structure, nor the meaning)

But is that correct? Or I must say "Who(m)"?

  • 1
    It's perfectly OK to use which of people when asking about the identity of one individual. – Kate Bunting May 18 '20 at 8:38

"Which" is used for things, children or inferior animals. Besides, "which" is used "to mean selection" :

e.g. A : "I want to meet Mr. Roy." B: "Which Mr. Roy do you want to meet?" (Selection)

In all the examples given by you, "which" has been used to show this selection :

"which is which", "which of you", "which one", "which you".

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