Pointing towards a photograph, Radha said, "This person is the son of my husband's father's only daughter." How is the person in the photograph related to Radha?

Nephew

The correct answer is Option (4) → Nephew

Let’s decode the relation step by step:

• Radha’s husband’s father → Father-in-law
• Father-in-law’s only daughter → Radha’s sister-in-law (husband’s sister)
• Son of that daughter → Son of Radha’s sister-in-law

That person is Radha’s nephew.