Looking at the wedding picture of a lady, Rakesh said, “The only son of her mother-in-law is the husband of my only daughter.” How is the lady related to Rakesh?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Daughter
A lady’s mother-in-law is the mother of her husband. If the mother-in-law has only one son, that son is the lady’s own husband.
The lady’s mother-in-law is the mother of the lady’s husband
The husband is a son of this mother-in-law, and she has only one son, so “the only son of her mother-in-law” is the lady’s husband
This man is also the husband of Rakesh’s only daughter
A man has one wife, so the lady and Rakesh’s only daughter are the same person
So the lady is Rakesh’s daughter

Why the other options are incorrect
Option (1) Daughter-in-law — Incorrect. A daughter-in-law is the wife of one’s son; the lady’s husband is Rakesh’s son-in-law, not his son.
Option (2) Niece — Incorrect. The lady is Rakesh’s own daughter, not the daughter of his brother or sister.
Option (3) Sister — Incorrect. The lady is Rakesh’s daughter, one generation below him.