If A ÷ B means A is the son of B, A + B means A is the daughter of B, and A - B means A is the brother of B, what is the relationship of C if A ÷ C + B?

Answer: B. C is the mother of A
A ÷ C means A is the son of C, and A + B means A is the daughter of B, so C is the mother of A.