P is the husband of Q. R is the only son of P and Q. S is the wife of R. How is Q related to S?

  • A. Mother
  • B. Mother in law
  • C. Sister in law
  • D. Aunt

Explanation

R is Q's son, and S has married him, so Q is S's mother in law. Relationships created by marriage always carry the in law suffix. Q is the mother only of R, not of S.

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