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

B. WIFE

If P is the uncle of Q and Q is the daughter of R, what is the relationship of R to P?

C. SISTER-IN-LAW

If S is the grandmother of T and T is the son of U, what is the relationship of U to S?

C. DAUGHTER-IN-LAW

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

A. BROTHER

If X is the daughter of Y, and Y is the sister of Z, what is the relationship of X to Z?

A. NIECE