Two themes that are clearly developed in this excerpt are pride and determination.
The author develops the theme of pride through Walter's speech to Lindner. Walter emphasizes the pride that his family has, stating that they come from people with a lot of pride and that they are very proud people. He expresses his family's pride in his sister becoming a doctor and in his son being the sixth generation of their family in the country. This pride is further reinforced by Walter's refusal to accept Lindner's offer of money to not move into the house, as he declares that his father earned the house for them brick by brick and they don't want to make trouble for anyone. The theme of pride is demonstrated through Walter's strong sense of self-respect and dignity, and his refusal to compromise his family's principles.
The theme of determination is also developed in this excerpt through Walter's decision to move into the house despite Lindner's offer. Walter asserts his family's decision to move into the house and make a better life for themselves, despite the challenges they may face. This determination is further demonstrated by Mama's support of Walter's decision and her refusal to entertain Lindner's attempts to persuade her otherwise. The family's united front in the face of adversity showcases their determination to overcome obstacles and fulfill their dreams.