Pointing to a photograph of a girl, Dev said, She is my wife's sister's mother's only son's daughter. How is Dev's wife related to that girl's paternal grandfather?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Daughter.
In the diagram shown;
Square shows males, the circle shows females, vertical lines show generations, a single horizontal line shows brothers or sisters, and double lines show a couple.

From the above figure, Dev's wife is daughter to that girl's paternal grandfather.
Hence, option 3 is the correct answer.