Discussion
How is M related to N?
Statements:
1. P, who has only two kids, M and N, is the mother-in-law of Q, who is sister-in-law of N.
2. R, the sister-in-law of M, is the daughter-in-law of S, who has only two kids, M and N.
Answer: A
From 1, 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 2, 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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