If X - Y means X is the brother of Y, X + Z means X is the sister of Z, and Y × Z means Y is the father of Z, what is the relationship of X to Z in X - Y + Z?
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 uncle of Y, what is the relationship of Z if X - Z + Y?