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

A. Y IS X'S BROTHER

If X - Y means X is the sister of Y, X + Y means X is the brother of Y, and X × Y means X is the father of Y, what is the relationship of Z if X - Z + Y = true?

B. Z IS THE SISTER OF Y

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 A + B means A is the brother of B, B - C means B is the sister of C, and C * D means C is the mother of D, what is the relationship of A to D?

C. UNCLE

If X * Y means X is the mother of Y, and Y ÷ Z means Y is the father of Z, what is the relationship between X and Z?

A. GRANDMOTHER