In a coded relation, 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 brother of N, what is the relationship of O if M + N × O?
In the coded relation A ÷ B means A is the son of B, B + C means B is the sister of C, and C - D means C is the mother of D. What is the relationship of A to D in the expression A ÷ B + C - D?