Riddle: Oldie but Goodie?

A man is staring at a portrait, a curious woman approaches the man and asks, "Who is that in the portrait?" The man replies:

"Brothers and sisters, I have none, but this man's father is my father's son."

Who is it?

Answer

Why is everyone saying 'himself?'

It's obviously his son

The guy in the pictures' father is the man himself (since his own father only has one son), making the guy in the picture his son

EDIT: I know i didn't explain that well so let me try again.

..."my father's son" refers to himself, as he has no brothers, so the sentence would be "this man's father is myself"
That would make the man his son

Hope you all understand now =D

Answer2

It is a portrait of himself because:

- "Brothers and sisters i have none"
By knowing this we know that he has no siblings that can be in this portrait.

- "This man's father is my father's son"
This means that the portrait of the man has a father and that same father is his son. Since he has no brothers or sisters, it can only mean that he is talking about himself.

Answer3

Its him because he has no brothers or sisters.He's an only child. the man's father is his father's son the man is his dad and he is his dads son.Simples

Answer4

Himself

Answer5

Himself !!!

Answer6

The man is looking at a portrait of himself.

Answer7

Himself?

Answer8

The man is looking at himself.

Answer9

His Son

Answer10

himself

Answer11

his cousin

Answer12

It's a picture of him.