Senior’s new wife is Black, and Loretta’s husband is Mexican, so both Uno’s parents have new families with people of their own respective races. Furthermore, at various points in the novel Ernesto uses racial slurs against Black people, and Senior disparages Mexican people. All this contributes to Uno’s complicated feelings about his racial identity. It’s strange that Uno laughs instead of feeling scared when he thinks he will get in trouble for breaking the window. In a way, it seems that he
wants to get into trouble. This, and the fact that he breaks the window at a time when he’s feeling anxious, suggests that causing trouble may be a coping mechanism for Uno.