If M ÷ N means M is the father of N, M + N means M is the daughter of N, and M - N means M is the son of N, what is the relationship of O if M ÷ N - O?
If A + B means A is the sister of B, A - B means A is the brother of B, and A × B means A is the mother of B, what is the relationship of C if A + B × C?