How does the scotch and milk that the narrator sends Sonny at the conclusion of Sonny's Blues affect the plot?

The scotch and milk symbolize the duality of life's hardships and comforts in "Sonny's Blues." It highlights the narrator's attempt to provide both solace and stability for Sonny, reflecting their complex relationship and the themes of struggle and hope in the story. It serves as a gesture of understanding and reconciliation between the two characters.