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 father - Man's father 

So, man's father is woman's father i.e woman is the man's sister.

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