How we cite our quotes: Chapter.Paragraph or Chapter.Section.Paragraph (depends on whether or not the chapter had sections - some did not)
Quote #1
The Dursleys had ignored his last two birthdays, and he had no reason to suppose they would remember this one. (1.26)
This sentence pretty much sums up Harry's experience with the Dursleys and clues us in to the awful people that they are.
Quote #2
"As I expected!"' said Aunt Marge, taking a huge swig of brandy and wiping her chin on her sleeve. "A no-account, good-for-nothing, lazy scrounger who –"
"He was not," said Harry suddenly. The table went very quiet. Harry was shaking all over. He had never felt so angry in his life.
[...]
"No, Vernon," hiccuped Aunt Marge, holding up a hand, her tiny bloodshot eyes fixed on Harry's. "Go on, boy, go on. Proud of your parents, are you? They go and get themselves killed in a car crash (drunk, I expect) -"
"They didn't die in a car crash!" said Harry, who found himself on his feet. (2.3.17-21)
As we discover in this book, nothing sets Harry off as fast as a disparaging remark about his family. We also love the irony of Aunt Marge dissing James for being a drunk loser while she herself is getting pretty wasted and belligerent at the moment.
Quote #3
"I notice they haven't made you two prefects."
"What do we want to be prefects for?" said George, looking revolted at the very idea. "It'd take all the fun out of life."
Ginny giggled.
"You want to set a better example for your sister!" snapped Mrs. Weasley.
"Ginny's got other brothers to set her an example, Mother," said Percy loftily. [...]
He disappeared and George heaved a sigh.
"We tried to shut him up in a pyramid," he told Harry. "But Mum spotted us." (4.2.86-9)
The interactions we see in Weasley clan are the best examples of family dynamics in the entire book.