Brothers or sisters, I have none. But this man's father is my father's son. Question:Who is "this man"?
I am my father's son, which means that the man's father must be me. This also means that the said man must be my son. In simpler terms, you are talking about you and your son. Check out more riddles on www.etni.org.il/farside/riddleanswers.htm.
His son lol
You forgot to mention the man is looking at a portrait.
See a song called "Im my own grandpa" by Uncle Floyd.
i think its you
"this man" is some random guy.
It's a secret. We must not tell.