Pointing to a woman, Neha said, “She is the only daughter of my brother’s father-in-law.” How is the woman related to Neha?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Sister-in-law
A man’s father-in-law is the father of his wife. If the father-in-law has only one daughter, she is that man’s wife.
Neha’s brother’s father-in-law is the father of the brother’s wife
The brother’s wife is a daughter of this man, and he has only one daughter
So the woman is the wife of Neha’s brother: she is Neha’s sister-in-law

Why the other options are incorrect
Option (2) Sister — Incorrect. The woman is the daughter of the brother’s father-in-law, not of Neha’s own parents.
Option (3) Aunt — Incorrect. An aunt is a parent’s sister or a parent’s brother’s wife; the woman is married to Neha’s brother, in Neha’s own generation.
Option (4) Cousin — Incorrect. A cousin is the child of an uncle or an aunt; the woman married into the family through Neha’s brother.