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

B. BROTHER

X is the father of Y. Y is married to Z. What is Z's relation to X?

B. DAUGHTER-IN-LAW

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 ÷ Y means X is the father of Y, Y * Z means Y is the daughter of Z, and Z + W means Z is the brother of W, what is the relationship of X to W?

B. UNCLE

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

A. NIECE