Only sun of her grandfather ? Her father; man's brother's father ? man's father.
So, man's father is her father
i.e, She is the man's sister.
The sex of A is not known. So. neither (a) nor (b) is definitely true. Clearly, D is the grandmother of A and F.
M is the brother of N and B is the brother of N.
So, M is the brother of B
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