Introducing a girl to his girlfriend, Ajay said," Her only brother's mother is the only child of my grandmother." How is Ajay related to this girl?

Brother

The correct answer is Option (1) → Brother

Statement: "Her only brother's mother is the only child of my grandmother."

Let’s decode:

• Ajay says: Her only brother's mother = the girl’s mother.
• That woman (the girl’s mother) = the only child of Ajay's grandmother.
• So, the girl's mother is Ajay's mother.

Hence, the girl is the daughter of Ajay's mother ⇒ the girl is Ajay's sister.

Final relation: Ajay is the brother of the girl.