Scout accuses Dill of lying when he says that he has no father.
Dill is always telling stories, but the Finch children do not normally pay attention. When Jem and Scout first meet Dill, he has a hard time explaining his family situation.
"I haven't got one."
"Is he dead?"
"Then if he's not dead you've got one, haven't you?" (ch 1)
Dill does not want to admit that his father left, and his mother sent him away. Dill’s home life is far from happy. He makes up stories about how wonderful his father is, and the great things they do together, to hide the fact that he is in pain.
Despite Dill's whoppers, Scout and Jem enjoy his company and his stories. They look forward to his summer visits.