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 + B × C?
If X * Y means X is the sister of Y, X + Y means X is the father of Y, and X - Y means X is the mother of Y, what is the relationship of Z if X * Y - Z?
If P - Q means P is the sister of Q, P + Q means P is the brother of Q, and P × Q means P is the father of Q, what is the relationship of R if P - R + Q?