If M * N means M is the sister of N, M + N means M is the brother of N, and M ÷ N means M is the mother of N, what is the relation of O if M * O + N?

B. O IS THE SISTER OF N

If P × Q means P is the father of Q, P - Q means P is the son of Q, and P + Q means P is the daughter of Q, what is the relationship of R if P × R + Q = true?

A. R IS THE DAUGHTER OF Q

If A + B means A is the brother of B, A - B means A is the sister of B, and A × B means A is the father of B, what is the relationship of C if A + C - B?

A. C IS THE SISTER OF B

If A - B means A is the father of B, A + B means A is the daughter of B, and A ÷ B means A is the son of B, what is the relationship of C if A - B ÷ C?

C. C IS B'S SON

X is the father of Y. Y has a sister Z. W is the son of Z. How is W related to X?

A. GRANDSON