This family riddle says: “Brothers and sisters I have none, but this man’s father is my father’s son.” Who is in the photo?
The answer is: his son.
The key is the statement that the speaker has no brothers or sisters. Because of that, the phrase “my father’s son” can only refer to the speaker himself.
So when he says, “This man’s father is my father’s son,” he is really saying, “This man’s father is me.” If the man in the photograph has the speaker as his father, then the person in the photograph must be the speaker’s son.
The wording sounds complicated, but once you replace “my father’s son” with “me,” the relationship becomes straightforward.
