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If 'A' is the brother of 'B', 'C' is the sister of 'A', and 'D' is the brother of 'C', how is 'B' related to 'D'?
Brother
Sister
Brother or Sister
Father
Brother or Sister
Identify gender only for those defined; since B's gender is never specified, they must be either a brother or a sister to the others.
Identify gender only for those defined; since B's gender is never specified, they must be either a brother or a sister to the others.
Establish the sibling structure
A, C, and D are siblings. A is the brother of B (A is male), C is the sister of A (C is female), and D is the brother of C (D is male). Thus, A, C, and D are all siblings.
Evaluate B's relation
The relationship 'A is the brother of B' tells us A's gender, but it does not specify B's gender. B could be male (brother) or female (sister).
Final Conclusion
Since B is a sibling to A, C, and D, and B's gender is unknown, B is either a brother or a sister of D.
A: Incorrect because it assumes B is male, which is not stated. B: Incorrect because it assumes B is female, which is not stated. D: Incorrect because B is in the same generation as D, not the parent generation.
C is correct because B is a sibling of D, but since B's gender is not defined by the given information, B must be either a brother or a sister.
In blood relation problems, always look for the gender marker; if a person's name or relationship description provides no specific gender (like B in this case), the answer usually involves a combined 'or' option.