If X × Y means X is the father of Y, Y - Z means Y is the sister of Z, and Z + W means Z is the brother of W, what is the relationship of X to W in X × Y - Z + W?
If M + N means M is the sister of N, N × O means N is the mother of O, and O - P means O is the brother of P, what is the relationship of M to P in M + N × O - P?
In a coded relation, if A ÷ B means A is the father of B, B - C means B is the sister of C, and C + D means C is the brother of D, what is the relationship of A to D in A ÷ B - C + D?