Adult Child: Her rivalry with Alicia can be very petty.
Adult Child has been renamed to One of the Kids. In order for this to be an example of the trope, the character's childishness has to be from or demonstrated by interacting with children. These examples can be added back with context relevant to the trope if they fit.
"Learning without thinking is labor lost. Thinking without learning is dangerous."
I pulled these two entries for not having enough context.
Adult Child has been renamed to One of the Kids. In order for this to be an example of the trope, the character's childishness has to be from or demonstrated by interacting with children. These examples can be added back with context relevant to the trope if they fit.
"Learning without thinking is labor lost. Thinking without learning is dangerous."