If X - Y means X is the sister of Y, X + Y means X is the brother of Y, and X ÷ Y means X is the mother of Y, what is the relationship of Z if X ÷ Z - Y = true?
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?
In a coded relationship, 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 daughter of Q, what is the relationship of R if P × R ÷ Q means P is the mother of R and R is the father of Q?