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

B. WIFE

If A is the brother of B, and C is the sister of A, what is C's relation to B?

A. SISTER

If M is the father of N and N is the son of O, what is the relationship between M and O?

B. HUSBAND AND WIFE

If G is the daughter of H and H is the sister of I, what is G's relation to I?

A. NIECE

If M is the uncle of N and N is the daughter of O, what is M's relation to O?

C. BROTHER-IN-LAW