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P is the mother of Q and R. If S is the husband of R, then what is P to S?

P is the mother of Q and R. If S is the husband of R, then what is P to S?

Explanation
  • P is the mother of Q and R.
  • S is the husband of R, meaning R is S’s wife.
  • Since P is R’s mother, she becomes S’s mother-in-law.