Discussion
A has 3 children. B is the brother of C and C is the sister of D, E who is wife of A is the mother of D. There is only one daughter of the husband of E. How is D related to B ?
Answer: D
D is B's brother.
A and his wife E have three children: B, C and D. B is a brother of C, and C is a sister of D, so C is a daughter. The statement that A (the husband of E) has only one daughter means C is that daughter, so the third child, D, must be a son.
D is therefore a son of the same parents as B, B's brother. 'Sister' is ruled out because C is the only daughter, and D cannot be B's mother or father since they are siblings.
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