J is the mother of U. U is the sister of N. D is the father of R. R is the son of N. How is J related to D?
Wife's mother
Track the relationships one by one.
J is the mother of U, and U is the sister of N — so J is also the mother of N.
D is the father of R, and R is the son of N — so N is R's parent alongside D, making N the mother of R and D's wife.
J is the mother of N (D's wife), so J is D's wife's mother — i.e., D's mother-in-law.
Hence, the answer is Wife's mother.
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