D is the son of E. F is the daughter of D. How is E related to F?

B. FATHER

P is the daughter of Q. R is the father of P. S is the sister of R. How is S related to Q?

A. SISTER-IN-LAW

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 means A is the brother of C and C is the sister of B?

A. C IS A'S SISTER

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

A. D IS B'S SISTER

If A is the brother of B, and B is the sister of C, what is the relationship of A to C?

A. BROTHER