A man is looking at a portrait of someone. Then, pointing to the person in the portrait he says, “Brothers and sisters, I have none, but that man’s father is my father’s son. Who is the person in the portrait?  

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Answer: Since the person pointing to the portrait has no siblings, the phrase, “My father’s son.” can be replaced with the word “me.” The statement, “That man’s father is my father’s son,” reduces to “That man’s father is me.” So the person in the portrait is his son.

 

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