Use Of A Machine That Would Then...
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No best answer has yet been selected by newtron. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.There is no correct answer because the riddle contradicts itself. "My father's son" is myself, therefore "that man's brother" must be myself. But the speaker does not have any brothers, therefore there is a contradiction and the riddle is insoluble.
If, however, the correct wording of the riddle is "Brothers or sisters I have none, but that man's father is my father's son. Who is that man?", then the correct answer is that he is looking at his son.