If X is the brother of the son of Y, how is X related to Y?

Introduction / Context:
This short blood relation question checks your understanding of a simple two step phrase: "brother of the son of Y". By correctly expanding this phrase, you can determine how X is related to Y. Questions like this appear frequently in reasoning sections because they are quick to test careful reading.

Given Data / Assumptions:

• X is the brother of the son of Y.
• "Son of Y" is a male child of Y.
• We assume that the brother being mentioned, X, shares the same parents as that son, which is standard in such questions.
• We are asked to describe X relation to Y using one of the options provided.

Concept / Approach:
The phrase "son of Y" defines a person S who is a male child of Y. When X is said to be the brother of S, X is another male child of Y under normal assumptions. Hence, both S and X are sons of Y, and X relation to Y is simply that of a son.

Step-by-Step Solution:
Step 1: Let S be the son of Y. So S is a male child of Y.Step 2: X is described as the brother of S. That means X is also a male and shares at least one parent with S.Step 3: In typical reasoning questions, this sharing of parents is taken to mean that X is also a child of Y.Step 4: Therefore, X is another son of Y.Step 5: The relation of X to Y is thus son.

Verification / Alternative check:
Take an explicit example. Let Y be a person named Raghav. Suppose Raghav has two sons: Arjun and Karan. If we choose S to be Arjun, then "the son of Y" is Arjun. "The brother of the son of Y" is Karan. So in this example, X would be Karan, and Karan is clearly another son of Raghav. This matches the conclusion that X is Y son.

Why Other Options Are Wrong:
X cannot be Y brother because that would require X to be in the same generation as Y, not one generation below. X is not a cousin because cousins are children of siblings, not siblings of each other; here, X and S are siblings, not cousins. Grandson would put X two levels below Y, which contradicts the direct link implied by being the brother of a son. Father is opposite the direction indicated and not supported by the statement.

Common Pitfalls:
A common error is to think that "brother of the son of Y" always refers to a different generation, but in reality that phrase still points to someone in the child generation of Y. Always count generations: Y at the parent level, the son at one level below, and the brother of that son still at the same level.

Final Answer:
X is related to Y as a son.