WHO/ Whom

Question

about who her parents are.orabout whom her parents are.

Avangi · Accepted Answer

Anonymousabout who her parents are.

This one is correct. "Her parents are who." (subjective case)
The whole clause is object of the preposition "about."

I have a question about who her parents are.
I have a question about Algebra.
I have a question about him. In this case, "him" is in objective case because it stands alone as object of the preposition.

rhetorical question: You're asking me about whom? Again, "whom" stands alone.

But when the object of a preposition is a finite clause (as in your example), the subject of that clause must be in subjective case. (who)

WHO/ Whom

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