The Weasleys' reactions would be complex. Arthur, with his curious nature, might study the fanfictions to understand how Muggles view their world. Molly would likely be more conservative in her views, not liking any fanfiction that distorts the family values. The younger Weasleys would be more likely to embrace the creativity, with Fred and George looking for ideas to use in their pranks, and Ginny might enjoy seeing herself in different heroic scenarios.
Well, some of them like Ron might be a bit skeptical at first. He's used to the 'real' Harry Potter world. But as he reads on, he might get into it. Fred and George, on the other hand, would probably look for ideas in the fanfiction that they could use for their pranks or joke products. Ginny would likely enjoy reading about different versions of Harry and her own character development in the fan - made stories.
They would likely be disgusted. The Dursleys are so anti - magic that any form of fan - created stories about the magical world would be abhorrent to them.
The Dursleys' reaction would be complex. Vernon would be enraged and might even try to burn any fanfiction he found. Petunia would be conflicted. Part of her would be disgusted, but a small part might be a bit curious as she has some connection to the wizarding world through Lily. Dudley might be more interested than his parents, especially if the fanfiction had some action or adventure that appealed to his more adventurous side.
Well, they might be quite amused. The Weasleys are a fun - loving family. They could find the different interpretations in the fanfiction really interesting and perhaps have a good laugh about some of the wilder ideas.
Their view might expand. They'd see different takes on the wizarding world that they hadn't considered before.
They would probably be very emotional. Some of them might cry, especially Molly, seeing all the pain Harry has been through.
They'd probably be horrified. The Dursleys are very much against the idea of magic, and fanfiction might introduce even wilder ideas about the wizarding world.
He could be shocked. Maybe there are some fanfictions that take a very dark turn or have unexpected pairings that he never thought of. He'd probably need some time to process such strange ideas. And he might also be curious to see how far the creativity of the fans can go. He might even get some new ideas about his own life from reading some of the more imaginative fanfictions.
The Weasleys' understanding could be both broadened and a bit muddled. On one hand, they might see new interpretations of old magic or different ways characters could have interacted. For example, if the fanfiction explored a different side of Snape's actions in Book 6, it could make them think. But on the other hand, they might be confused as some fanfictions can be really out - there. They'd have to sort through what was based on real knowledge of the wizarding world and what was pure imagination.
At first, Hermione would be heartbroken. She has shared so many experiences with the Weasleys. However, her strong will would soon take over. She would probably focus on proving her innocence if that was the cause of the betrayal. She might also try to find a way to reverse whatever situation led to the Weasleys' betrayal. If it was a matter of the Weasleys' own wrong beliefs, she would try to show them the truth, but if they refused to listen, she would distance herself from them while still remaining true to her own values and the greater good.