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