If X is the father of Y and Y is the daughter of Z, what is Z's relation to X?

C. MOTHER

If M is the grandmother of N and N is the son of O, what is O's relation to M?

B. SON

If J is the brother of K and K is the father of L, what is J's relation to L?

B. UNCLE

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

A is the brother of B. C is the sister of A. D is the mother of B. How is D related to C?

B. MOTHER