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M, S, A, F, J, H and D are seven family members living in the same apartment. M is SтАЩs husband. H is JтАЩs wife. S is the mother of J and daughter of A. D is the brother of H. F is the wife of A. How is D related to J?
WifeтАЩs brother
Father
Husband
Brother
WifeтАЩs brother
Visualize the family tree generationally: A and F are grandparents, S is their daughter, J is their grandchild, and H is married to J, making H's brother D the brother-in-law of J.
Visualize the family tree generationally: A and F are grandparents, S is their daughter, J is their grandchild, and H is married to J, making H's brother D the brother-in-law of J.
Establish the parental generation
A and F are husband and wife. Since S is the daughter of A, S is also the daughter of F. M is S's husband, so M and S are parents to J.
Map the younger generation
S is the mother of J. H is the wife of J. Therefore, J is the husband of H. Since D is the brother of H, D is the brother-in-law of J.
Define the relationship
As H is the wife of J, and D is the brother of H, D is the brother of J's wife, which is the definition of a brother-in-law (Wife's brother).
B is incorrect because D is of the same generation as J and H, not the parental generation. C is incorrect because D is a brother, not a husband. D is incorrect because D is the brother of J's wife, not J's biological brother.
A is correct because H is the wife of J and D is the brother of H, which logically defines D as the wife's brother of J.
In blood relation puzzles, always identify the spouse links first (indicated by 'husband/wife') to anchor the family tree, then map the children and siblings.
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