You have a father who is a huge prankster, he would prank you and you're other siblings so at the time you were all ready used to it even tho you would complain to you're mother who didn't do shit..

Then one day it was Christmas you're father got you so he asked what you want you were suspicious of his words but told him you wanted a 40 dollar book you always wanted.

but he gave it to you're little sister

Father: "You're sister wanted it more, I'm sure you'll understand?."