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We have: X is brother of W and W is only daughter of C. B is brother-in-law of A, who is sister of C, as A is unmarried member of family, that means B is married to C. Based on above given information we have: Clearly, only five female member are there in the family. Hence, statement I is alone sufficient. From Statement II:We have:  L is son of Z and is son-in-law of X. L is brother-in-law of R, as R is unmarried member of the family. P and R are siblings. R is only son of Y, that means X is married to Y and P is married to L. Y is brother-in-law of W. W is only son of C, who is married to B, that means W is brother of X. B is sister of A, that means C is father of W. Based on above given information we have:
Clearly, gender of A and Z is not known. Hence, statement II is not sufficient.
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