Jeffrey isn't sick, Doctors get things wrong all the time. 
Anger
Bargaining 
God, if I don't eat this food you'll cure Jeffy.
Steven wasn't having a great time believing that his brother was actually sick so he just kept saying that the doctors were wrong and that it was just an accident so he was in denial and couldn't understand that he was actually sick.
Depression 
Steven doesn't like that Jeffy is sick so he kept exploding on his parents and saying things like you left me with no word of anything and he went on rants and recapped everything to his parents because he was mad and didn't know what to do. 
Acceptance 
ok Jeffy which one do you think this person is, frowny or smiley. 
Steven kept bargaining with God and asking him things like if I don't eat this you cure Jeffy and things like that because he didn't want for Jeffy to die due to cancer. 
All Stages of Grief
Steven shows some depression because he zones out in class, and keeps himself away from others by drumming. 
He shows acceptance when he starts joking with Jeffrey, and playing games that will make him laugh like the frowny smiley game. 
Steven feels all of these emotions because his brother had gotten sick with cancer and he didnt know how to feel about it. 
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