How we cite our quotes:
Quote #4
"Look at the graveyard!" the grandmother said, pointing it out. "That was the old family burying ground. That belonged to the plantation."
"Where's the plantation?" John Wesley asked.
"Gone With the Wind" said the grandmother. "Ha. Ha." (22-24)
The grandmother's connection to the Old South is made more direct here; apparently the family once owned a plantation. Just like naming her cat after a character in The Mikado, it seems as if the grandmother is eager to display a certain degree of cultural knowledge, appropriate to someone of her social status.
Quote #5
The grandmother said she would have done well to marry Mr. Teagarden because he was a gentleman and had bought Coca-Cola stock when it first came out and that he had died only a few years ago, a very wealthy man. (26)
Again with the gentleman and lady business. To the grandmother, both money and social class are important.
Quote #6
"These days you don't now who to trust," [Red Sammy] said. "Ain't that the truth?"
People are certainly not nice like they used to be," said the grandmother. (34-35)
Both the grandmother and Red Sammy seem to think that people of "this day and age" are worse than they used to be – less decent, less respectable, less trustworthy. For both (and for Red Sammy's wife), good people are hard to find nowadays because there's been a decay in the southern culture and in manners.