Introducing a man to her husband, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to this man?

Introducing a man to her husband, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to this man? Correct Answer Sister

Only son of woman's grandfather---Woman's father; Man's brother's sister---Man's father.
So, man's father is woman's father i.e. woman is the man's sister.

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