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 means A is the brother of C and C is the sister of B?

C. C IS THE DAUGHTER OF A

In a coded relation, if P × Q means P is the mother of Q, P ÷ Q means P is the son of Q, and P + Q means P is the sister of Q, what is the relationship of R if P × R ÷ Q means P is the mother of R and R is the son of Q?

B. R IS THE SON OF P

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

A. GRANDSON

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