O @ N # M means O is the father of N who is the sister of M i.e. O is a father of two children.
D is father of A and grandfather of F. So, A is father of F.
Thus, D and A are the two fathers. C is the sister of F So, C is the daughter of A.
Since there is only one mother, it is evident that E is the wife of A and hence the mother of C and F.
So, B is brother of A There are three brothers. So, F is the brother of C.
Clearly, B and A are brothers. F is the brother of C So, three brothers are A, B, F.
A is a male and married to B. So, A is the husband and B is the wife. C is the brother of A. D is the son of C. E, who is the sister of D will be the daughter of C. B is the daughter-in-law of F whose husband has died means F is the mother of A.
Clearly, F is the mother of A.
E is the daughter of A and F is the mother of E. So, A is the father of E and hence the husband of F. Now,
D is the daughter of F. So, D and E are the daughters of A and F Also. A is the son of C.
Now, only B remains. Thus, B and C are the parents of A.
The sex of B and C cannot be determined:
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