Rahul's father is the only son of Rohan's Father. How is Rohan's wife related to Rahul?

Mother

To solve this riddle, let's break down the relationships step-by-step:

1. "Rohan's Father" is a specific person.
2. "The only son of Rohan's Father" must be Rohan himself (since he is a son of his father, and there are no other sons).
3. Therefore, the statement "Rahul's father is the only son of Rohan's Father" translates to: Rahul's father is Rohan.
4. Since Rohan is Rahul's father, Rohan's wife must be Rahul's Mother.