A is the mother of B. B is the sister of C. D is the father of C. How is A related to D?

  • A. Sister
  • B. Wife
  • C. Daughter
  • D. Mother

Explanation

B and C are siblings, so they share the same parents, and since A is the mother and D the father of that pair, A is D's wife. Drawing a simple family tree with one horizontal line for each generation makes this immediate. Sibling links always point back to a shared set of parents.

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