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

B. BROTHER

If M is the father of N and N is the son of O, what is the relationship of O to M?

D. MOTHER

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

A. NIECE

G is the son of H, and I is the daughter of H. What is I to G?

A. SISTER

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

A. BROTHER