A and B are a married couple. X and Y are brothers, and X is also the brother of A. In this family relation problem, how is Y related to B?

Introduction / Context:
This is a short blood relation question involving a married couple A and B, and two brothers X and Y. We are told that X is the brother of A and that X and Y are brothers. The task is to decide how Y is related to B. This problem checks ability to recognise in law relationships, particularly the idea of brother in law.

Given Data / Assumptions:
• A and B are married to each other.• X and Y are brothers.• X is the brother of A.• All relations are within one extended family.

Concept / Approach:
If X is the brother of A, then X is a brother in law of B because A and B are married. Y is also a brother of X, so Y is another brother of A. That means A has two brothers, X and Y. As a result, Y is also a brother in law of B. The main idea is that siblings of one spouse are brothers in law or sisters in law to the other spouse.

Step-by-Step Solution:
Step 1: Identify A and B as a married couple.Step 2: X is given as the brother of A, which makes X a sibling of A.Step 3: From the marriage, A's brother X is a brother in law of B.Step 4: X and Y are brothers, so Y is also a sibling of A.Step 5: Any sibling of A is a brother in law or sister in law of B.Step 6: Since Y is male, he is a brother in law of B.

Verification / Alternative check:
Think of A and B as a couple. A has two brothers X and Y. These brothers are not directly related by blood to B, but they enter the family through the marriage. B will refer to both X and Y as brothers in law. There is no indication that Y is a cousin, uncle or any other type of relative. The simplest and direct relationship is brother in law.

Why Other Options Are Wrong:
Brother of B: That would require Y to share parents with B, which is not stated.Son in law of B: A son in law would be a husband of B's child, not a sibling of B's spouse.Cousin of B: Cousins share grandparents, which is not suggested by the information.Uncle of B: An uncle is a brother of a parent or spouse of an aunt, which is not consistent here.

Common Pitfalls:
Sometimes candidates see multiple brothers and quickly think of cousins or more distant relations. However, the presence of a clear married couple A and B and the identification of X as brother of A strongly guides us to the in law framework. Once we see that X is brother in law of B, it is easy to extend the same logic to Y as another brother of A.

Final Answer:
Y is the brother in law of B.