Kiran is the father of Ravi. Ravi is the brother of Kavya. Then, how is Kavya…

CONCEPT: In a family-relation (blood-relations) puzzle, two people who share the same father or mother are siblings. The word 'brother' fixes only the speaker's own gender as male — it does not, by itself, state the other sibling's gender; that comes from the name or wording given, since a father's child is called his son or his daughter depending on that gender.

APPLICATION: Kiran is the father of Ravi, so Ravi is Kiran's child. Ravi is the brother of Kavya, so Ravi and Kavya are siblings who share the same father, Kiran. The name Kavya is a female name, so Kavya is Kiran's daughter, not his son.

CROSS-CHECK — the other options do not fit:

• Mother-in-law would require a marriage relationship (e.g. being the mother of one's spouse); no marriage appears anywhere in this puzzle, only a father-child link.

• Sister correctly describes Kavya's relation to Ravi, but the question asks for Kavya's relation to Kiran, a different person.

• Grandmother belongs one generation above Kiran; Kavya, as Ravi's sibling, is in the same generation as Ravi — one generation below Kiran, not above.

So Kavya is Kiran's daughter.