On the other hand, Billy and his dad, Mr. Simpson, are quite restricted within their psychological cages. They are united in their concern for Eugene. .
The mother, Mrs. Simpson, seems to have given up on trying to guide and direct her family's lives in an emotional sense. She may now just look after their physical needs, but then appears to retreat to her bedroom and makes herself unaware of any emotional needs. "I think she's just so goddamn tired of the three of us, she's gone permanently deaf to the sound of our voices." (pg. 368). By behaving in this manner, she has she released herself from all cages by choosing not to be emotionally involved in any way. .
Eugene also doesn't seem to have very many internal or external restrictions on his behavior. His only responsibilities appear to be to himself. His psychological cage may be a self-fulfilling prophecy in which everyone expects him to mess up, so he does. "Of course, Gene has done a fair number of bad things while everybody was waiting around for him to do the one great big terrible thing" (pg 365). Eugene never appears to worry about the consequences of his behavior, on the other hand that seems to be Billy and his father's greatest worry.
Mr. Simpson feels very responsible and concerned with both of his sons" behavior. Gene gets most of his father's attention because he is always messing up and disobeying the rules. The dad is stuck in a dead-end job and he just wants his children to have a better life than him. "Ever since we were little kids he's been threatening us with it [the cage]. Make something of yourself, he"d warn us, or you"ll end up like you old man, a monkey in a cage!" (pg. 368). Since Mrs. Simpson doesn't seem to have a big role in her family's lives, Mr. Simpson has to deal with their sons on him own. He is trying to maintain a steady job and care for his sons at the same time, therefore he opts to share his responsibilities with Billy.