A prison warden challenges a death row inmate that he can earn his freedom if he can create a riddle that the warden cannot solve. On the day of his execution, a man comes to visit the prisioner. The prisoner asks for the warden. When the warden comes in the prisoner gives him this riddle about his visitor.
The prisoner says: Brothers and Sisters have I none, But that man's father is my father's son. Who is that man?
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Since the prisoner has no brothers or sisters, "my father's son" in the riddle would mean the prisoner himself.
Therefore, the prisoner is the visitors father. The visitor is the prisoner's son.
Since, the riddle is so simple to solve, the prisoner is executed.