If P - Q means P is the daughter of Q, P + R means P is the sister of R, and Q × R means Q is the mother of R, what is the relationship of R to Q?

B. R IS Q'S DAUGHTER

If X ÷ Y means X is the father of Y, X - Z means X is the sister of Z, and Y + Z means Y is the brother of Z, what is the relationship of Z to Y?

A. Z IS Y'S SISTER

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 mother of Z, what is the relationship of Z to X?

B. BROTHER

A is the brother of B. C is the sister of B. D is the mother of A. How is D related to C?

B. MOTHER