If D is the daughter of E and F is the son of E, what is F to D?

A. BROTHER

If X + Y means X is the uncle of Y, X - Y means X is the aunt of Y, and X ÷ Y means X is the brother of Y, what is the relationship of Z if X + Y ÷ Z?

B. Z IS Y'S BROTHER

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

A. C IS A'S BROTHER

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

C. SISTER-IN-LAW

If M is the grandmother of N and O is the mother of N, what is O to M?

A. DAUGHTER