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

A. SISTER

If K is the grandmother of L and L is the son of M, what is the relationship of M to K?

C. DAUGHTER-IN-LAW

If S is the uncle of T and T is the daughter of U, how is S related to U?

C. BROTHER-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?

A. C IS THE SISTER OF B

X is the father of Y. Z is the mother of Y. What is Z's relation to X?

B. WIFE