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 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 = true?

A. C IS THE SISTER OF B

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

A. BROTHER

If X * Y means X is the father of Y, and Y ÷ Z means Y is the daughter of Z, what is the relationship between X and Z?

C. GRANDFATHER

D is the daughter of E, and F is the brother of E. What is F to D?

A. UNCLE