If M × N means M is the grandmother of N, M + N means M is the grandfather of N, and M - N means M is the aunt of N, what is the relationship of O if M × O + N?

B. O IS THE SISTER OF N

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

A. UNCLE

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

C. WIFE

If P is the sister of Q, and Q is the mother of R, what is the relationship of P to R?

A. AUNT