A man said, “The person is my wife’s father’s only son.” How is the person related to the man?

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1. **My wife's father** means my father-in-law.
2. **Only son** means the single male child ($1$) of that father.
3. That male child is the wife's brother. The man is not his own father-in-law.
4. So the person is the man's **brother-in-law**.

FINAL_ANSWER: a

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