The Family Puzzle

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.”
Who is in the painting?

The man’s son.

The man says, “That man’s father is my father’s son.”
Since he has no brothers or sisters, “my father’s son” must be himself.
Therefore, “that man’s father” is him, which means that man in the painting is his son.

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