Pointing to a photograph, Vipul said, "She is the daughter of my grandfather's only son." How is Vipul related to the girl in the photograph?

Introduction / Context:

This is a shorter blood-relation question where a single sentence describes a photograph and you must identify how the speaker is related to the person shown. The key phrase is "my grandfather's only son", which usually refers to the speaker's father in standard exam conventions. From there, the relation between Vipul and the girl can be worked out easily.

Given Data / Assumptions:

• Vipul is speaking and pointing to a photograph of a girl.
• He says, "She is the daughter of my grandfather's only son."
• "My grandfather's only son" is assumed to be Vipul's father, following normal family patterns.
• We are asked: How is Vipul related to the girl?
• We assume a simple family with no step-parents unless explicitly stated.

Concept / Approach:

The central step is to correctly identify "my grandfather's only son". Once we accept that this person is Vipul's father, then the girl becomes the daughter of Vipul's father. That makes her a child in the same generation as Vipul, and we must decide the correct sibling relationship. Finally, we phrase the relationship from Vipul's side, not from the girl's side.

Step-by-Step Solution:

Verification / Alternative check:

Suppose Vipul's grandfather G has one son F (Vipul's father), and F has two children: Vipul and a girl X. Then X is "the daughter of my grandfather's only son" when described by Vipul. In that setup, X is clearly Vipul's sister, so Vipul is her brother. This matches the reasoning above and confirms the conclusion.

Why Other Options Are Wrong:

Vipul cannot be the girl's father because nothing in the statement places him a generation above her; both are children of the same father.

He cannot be a cousin, because cousins share grandparents but have different parents. Here, the girl and Vipul share the same father.

"Data inadequate" is incorrect because the phrase "only son" identifies the father uniquely enough to deduce a sibling relationship without ambiguity.

Common Pitfalls:

Some candidates misread "my grandfather's only son" as referring to Vipul himself, but that would mean Vipul is a son of his own grandfather without mentioning his father, which is unusual in these puzzles. The standard interpretation is that the grandfather's only son is the father of the speaker. Always check generation levels carefully, especially when grandparents are mentioned.

Final Answer:

Vipul is the girl's brother.