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Brothers and Sisters, I Have None

Solution Step 0/0
“Brothers and sisters, I have none. But that man's father is my father's son“ - said a man pointing to the picture on the wall.

Who is depicted on the picture?

Explanations

“Man's father“ is the father of the man in the picture. Simultaneously that father is identified as “my father's son“. Since the man has no siblings (based on the 1st claim), subsequently the “father“ equals himself. Being a father of the man from the picture, it means the person depicted there is in fact the man's son.
Check Man himself
Check His son
Check His nephew
Check His father

Puzzle Brothers and Sisters, I Have None

Puzzle Brothers and Sisters, I Have None