Wish that you were the fatter son!

You couldn't stand seeing that your wish made your brother bigger. It made him a massive fat man weighing nearly a ton and sitting next to the behemoth you've made your father. That should be you!

You pull out your powder and mix up a drink and chug it. "I wish I was the fattest son! I wish I was dad's big fat pride and joy that he wanted to fatten bigger than him! I wish we were always healthy and strong enough to walk and move around. I wish we could eat as much as an average person and not starve or be hungry, but we still had bottomless stomachs!"

As you finished your wish your head started to spin. Your vision got blurry and your body started to feel heavy. You could feel yourself passing out before your body hit the floor. When you finally came to your eyes fluttered open and you were excited by what you saw.

Were you almost as big as your dad? Or were you bigger than him? Or were there other unintended side effects?