This quote shows that Neil cares about his sister, when he was asked if he wanted to send her back to the training center. It also shows that he is very observant because he sees how much happier she is at home.
Neil, would you be happier if we sent Gerri back to the training center?
I don't think so, she doesn't bother me much
This shows that Neil is a well behaved kid, because he isn't used to going to the principle's office, when he does go, he gets really nervous.
I made my way down to his office, but I practically had to hold on to the walls. My legs felt so weak, it was like I'd been sick with the flu for a week and now was allowed out of bed for the first time.
This shows that Gerri was scared of Neil when he was mad at her, so she decided to hide under the covers of her bed.
I took a minute to run into Gerri's room and scream my head off at her, she just pulled the covers over her head and pretended she didn't hear me
In the beginning of the story, Neil is a shy, quiet kid, but since he has to transfer from private to public school when his mother brings his mentally disabled sister Gerri home from where she had been living, it is difficult for him to internally cope with her disability, so as a result he becomes more bold and expressive towards the end.
This shows that Neil gets really mad and offended when people mention his family in a negative way, so he tends to do things not completely thought out.
What are you retarded or something? Does it run in your family?
This shows that Neil was concerned that Gerri had done something to herself, or someone had done something to her.
What's happened to Gerri? Why does she look like that?
It was like he stuck my finger in an electric wall socket. I went berserk. I picked the extra pizza off his plate, lifted it into the air, and mashed it into his face.
The side of my sister's head was blue-black and there was a bump over her ear.