In a family, there are four members: W, X, Y, and Z. W is the grandmother of Z, X is the father of Y, and Y is the daughter of Z. Who is the mother of Y?
If '+' represents addition, '-' represents subtraction, '×' represents multiplication, and '÷' represents division, what is the value of 8 ÷ 2 + 3 × 4 - 5?