P and Q are two brothers. A and B are two sisters. P's son is B's brother. How is Q related to A?

Uncle

The correct answer is Option (4) → Uncle

1. P and Q are two brothers. This means P and Q share the same parents.

2. A and B are two sisters. This means A and B share the same parents.

3. P's son is B's brother. This is the crucial link. If P's son is B's brother, it means P's son and B share the same parents. Since B's parents are A and B's parents, P must be the father of B (and therefore also the father of A, as they are sisters).

Now let's see how Q is related to A:

• Q is P's brother.
• P is A's father.

Therefore, Q is A's father's brother, which makes Q A's Uncle.