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?

A. C IS THE SISTER OF B

D is the mother of E and F. G is the father of E. How is G related to F?

B. FATHER

If J is the daughter of K, and K is the son of L, what is the relationship of L to J?

B. GRANDFATHER

M is the sister of N, and O is the son of N. What is M to O?

A. AUNT

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

B. MOTHER