Who is the person who helps Steven shave his head in Drums girls and Dangerous Pies?

In "Drums, Girls & Dangerous Pie" by Jordan Sonnenblick, it is Steven's younger brother, Jeffrey, who helps him shave his head. This moment is significant as it symbolizes their close bond and the support they provide each other during difficult times, especially as they navigate the challenges of illness and adolescence. The act of shaving Steven's head also serves as a way for him to cope with the emotional turmoil surrounding their family's struggles.