In a coded relation, if P ÷ Q means P is the mother of Q, P - Q means P is the daughter of Q, and P + Q means P is the son of Q, what is the relationship between R and S if R ÷ S + T?
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 brother of Y, what is the relationship between Z and Y if Z * X - Y?
If M × N means M is the daughter of N, M + N means M is the son of N, and M - N means M is the wife of N, what is the relationship between O and N if O - M + N?