Pointing to a lady a person said, "The son of her only brother is the brother of my wife." How is the lady related to the person?

Pointing to a lady a person said, "The son of her only brother is the brother of my wife." How is the lady related to the person? Correct Answer Sister of father-in-law

Brother of person's wife → brother-in-law of the person. Hence, the son of lady's brother is brother-in-law of the person.
Therefore, the brother of the lady is the father-in-law of the person. Hence, the lady is the sister of the person's father-in-law.

Related Questions

Pointing to a lady, a man said, " The son of her only brother is the brother of my wife." How is the lady related to the man?
A man said to a lady, "The son of your only brother is the brother of my wife." What is the lady to the man.