A is the brother of B. C is the sister of A. D is the mother of B. How is C related to D?

A. DAUGHTER

If D is the mother of E, and E is the daughter of F, what is the relationship of F to D?

B. FATHER

D is the mother of E and F. G is the father of E. How is G related to F?

B. FATHER

If A + B means A is the sister of B, A - B means A is the brother of B, and A × B means A is the mother of B, what is the relationship of C if A + B - C?

B. C IS A'S BROTHER

If A ÷ B means A is the daughter of B, A + B means A is the brother of B, and A - B means A is the sister of B, what is the relationship of C if A ÷ B + C?

A. C IS A'S BROTHER