'This mans father is my fathers son' puzzle.

Aug 2008
220
1
A man, pointing to a portrait, exclaimed, I have no sisters or brothers, but that man's father is my father's son.

The man whose portrait he was looking at was:
A) His father
B) His son
C) Himself
D) His uncle


Please detail how you deduced the answer! What was your methodology?
 
Dec 2009
3,120
1,342
A man, pointing to a portrait, exclaimed, I have no (living) sisters or brothers, but that man's father is my father's son.

The man whose portrait he was looking at was:
A) His father
B) His son
C) Himself
D) His uncle


Please detail how you deduced the answer! What was your methodology?
He wouldn't have a chance of being a nephew ?
Someone with no brothers may previously have had one.