If M × N means M is the mother of N, N - O means N is the sister of O, and O + P means O is the brother of P, what is the relationship of M to P in the expression M × N - O + P?
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?