A and B are brothers. C and D are sisters. A's son is D's brother. How is B related to C?

Options

A. Father
B. Brother
C. Grandfather
D. Uncle

Explanation

To solve the problem, we need to analyze the relationships step by step.

1. **Identify the Relationships**:
- A and B are brothers. This means they are in the same generation and both are male.
- C and D are sisters. This means they are in the same generation and both are female.

2. **Understanding A's Son**:
- The question states that A's son is D's brother. This means A has a son, who is a male, and this son is also the brother of D.
- Since D is a sister to C, it follows that A's son is also C's brother.

3. **Establishing the Family Tree**:
- From the above points, we can establish that:
- A (male) and B (male) are brothers.
- A has two children: a son (let’s call him E) and a daughter (D).
- D has a sister, C.
- Therefore, E (A's son) is the brother of D and C.

4. **Determining B's Relation to C**:
- Since B is the brother of A and A is the father of C, it follows that B is the uncle of C.

Thus, the final answer is that B is the uncle of C.