Pointing to a man in a photograph, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to the man in the photograph?

Pointing to a man in a photograph, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to the man in the photograph? Correct Answer Sister

The family chart is as follows:

As the Only son of a woman's grandfather means Woman's father; 
Man's brother's father means Man's father.

Drawing the family tree as per the given information:

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So, the woman is the man's sister.

Hence, the correct answer is "Sister".

Related Questions

The question below consists of two statements numbered I and II. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give the answer: How is Tanya related to the man in the photograph? (I) Man in the photograph is the only son of Tanya's grandfather. (II) The man in the photograph has no brothers or sisters and his father is Tanya's grandfather.
How is Tanya related to the man in the photograph ? Statements : I. Man in the photograph is the only son of Tanya's grandfather. II. The man in the photograph has no brothers or sisters and his father is Tanya's grandfather.
Question : How is Tanya related to the man in the photograph ?

Statements :
I. Man in the photograph is the only son of Tanya's grandfather.
II. The man in the photograph has no brothers or sisters and his father is Tanya's grandfather.