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

A. AUNT

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

C. COUSIN

If X * Y means X is the mother of Y, and Y + Z means Y is the brother of Z, what is the relationship of X to Z?

C. MOTHER

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

A. SISTER

D is the father of E. E is married to F. What is F's relation to D?

B. DAUGHTER-IN-LAW