Chary is nephew of A's father.
B is cousin of A, but not Chary's brother.
What is the relation of B to Chary ?
Chary is A's father's nephew means Chary is the son of A's father's brother
i.e, Chary is the cousin of A. B is also A's cousin.
So, B must be real brother or sister of Chary.
But B is not brother of Chary.
So, B must be sister of Chary.
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