Answers

2014-05-02T10:25:15+05:30
A and B are brothers
D is the daughter of A.
Thus, C is also the daughter of A.

As A and B are brothers,
  therefore, B is the uncle of C.
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2014-05-02T10:33:17+05:30
As A's son is D's brother therefore
D is a daughter to A
So C should also be a daughter to A
A and B are brothers 
So C's uncle is B(C's father's brother)
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