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That man's father is my father's son

A man is looking at a photograph. His friend asks who it is. The man replies:

"Brothers and sisters, I have none. But that man's father is my father's son."

Who is in the photograph? Work through the sentence phrase by phrase rather than trusting the first answer that comes to mind, because the most common answer is wrong.

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Work from the inside out. Who is "my father's son", given that the speaker has no brothers?

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