If D is the mother of E and E is the daughter of F, how is D related to F?

B. WIFE

If X is the daughter of Y, and Y is the sister of Z, what is X's relation to Z?

A. NIECE

If G is the son of H and H is the mother of I, what is the relationship of G to I?

A. BROTHER

If A is the brother of B and C is the sister of B, what is the relationship of C to A?

A. SISTER

If N is the sister of O and P is the brother of O, what is the relationship of P to N?

B. BROTHER