Last Puzzles (Family Relation Riddle)

A man is sitting alone on a bench in the park you go for your regular morning walks. In his hand, there is a picture at which he is looking constantly without blinking his eyes. You go to that man to find out. You ask him, 'Who is the bright person in that picture?' To your question he replies, 'Sisters and brothers I have none, but that man’s father is my father’s son' and then turns back to look at the picture. Can you tell the person in the picture?

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