Squigly Squigly's Brain Teasers

Question:

One man shows another the portrait of a gentleman and tells him: I have neither brothers nor sisters, but this man's father is the son of my father. Who is the man in the painting?

Answer:

The gentleman in the portrait is the son of the man who is speaking.

Try another Brain Teaser:

Two men play five complete games of checkers. Each man wins the same number of games. There are no ties. How?