1. I alone is sufficient while II alone is not sufficient
  2. II alone is sufficient while I alone is not sufficient
  3. Either I or II is sufficient
  4. Neither I nor II is sufficient
  5. Both I and II are sufficient
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1 Answers

Answer: Option 1

From I, we conclude that P is the mother of M and N, while Q is the daughter-in-law of P and sister-in-law of N. Thus, Q is M's wife and hence, M is N's brother. From II, we conclude that M and N are the children of S. Also, R is the daughter-in-law of S and sister-in-law of M. So, R is N's wife and thus, N is M's brother. Hence, M is either brother or sister of N.

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