A is the father of B. B is the sister of C. C is the daughter of D. Which statement must be true?
- A. A and D are married or are the parents of the same children
- B. A is the brother of D
- C. C is the son of A
- D. B and D are siblings
Explanation
B and C are sisters and daughters of the same family, so A as the father and D as the other parent must be the parents of both. C being a daughter rules out the third option. Nothing in the clues makes A and D siblings, and B is a child of D rather than a sibling.
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