Answer:
"They're not down on the da mn docks."
Step-by-step explanation:
Gary D. Schmidt's "Lizzie Bright and the Buckminster Boy" is about a young boy's friendship with a Negro girl against the society's acceptance. The story deals with themes of racism, loyalty, friendship, family, society, status, etc.
In the given excerpt, Turner is warned by his father against going to "visit a Negro girl on Malaga Island." But Turner seemed reluctant to obey what his father or society wants him to do. So, when his father mentioned that "[Lizzie's family are] down on the docks", Turner reiterates that they are not. His repetition of "they're not down on the da mn docks" shows his exasperated feeling about his father.