P is the uncle of Q. R is the sister of P. How is R related to Q?

A. AUNT

M is the daughter of N. O is the son of N. How is O related to M?

A. BROTHER

If A is the mother of B and B is the sister of C, what is A's relationship to C?

B. MOTHER

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