If M + N means M is the uncle of N, M - N means M is the aunt of N, and M × N means M is the cousin of N, what is the relationship of O if M + O - N = true?
In a coded relation, if P × Q means P is the mother of Q, P ÷ Q means P is the son of Q, and P + Q means P is the sister of Q, what is the relationship of R if P × R ÷ Q means P is the mother of R and R is the son of Q?
In a family, there are three generations. X is the grandfather of Y. Y has two siblings, A and B. A is the daughter of Z, who is married to Y's mother. What is the relationship of Z to X?