Ron could start by showing more respect towards Hermione's Muggle family. He could learn about Muggle culture and values, which would make Hermione's dad see that he is making an effort to understand their world.
I haven't come across any proper fanfiction with such a plot. In the 'Harry Potter' world, Hermione is Ron's friend and the relationship dynamics are based on friendship, adventure, and loyalty. Having a relationship like that between Hermione and Ron's father would be completely out of place and not in the spirit of the story.
The reaction would be extremely negative. The 'Harry Potter' universe has a strong sense of family and friendship. Hermione is an important part of Ron's friend group, and Ron's dad is like a parental figure in their world. A fanfiction with this inappropriate plot would not only be against the essence of the story but also against the moral and ethical values that the series promotes. Fans would likely shun any such work.
Well, in many fanfictions, Percy might be seen as too ambitious and career - focused. He could have made choices that put his job at the Ministry above his family. For example, he might have supported Ministry policies that the rest of the Weasleys disagreed with, like their stance on Harry Potter or how they were handling the growing threat of Voldemort. This could lead to the Weasleys being mad at him for seemingly choosing the wrong side or not standing by the family values.
Their relationship could develop through shared interests. For instance, if they both have a passion for magical inventions, they might start collaborating on some small projects at home. This would lead to them spending more time together and getting to know each other better.
Another plot could be that Ron's dad is in trouble, perhaps he's been wrongly accused of misusing magic at work. Hermione, being the brilliant witch she is, decides to help clear his name. She starts investigating, interviewing his colleagues and looking into the records. As she digs deeper, she uncovers a conspiracy within the Ministry that was set to frame Ron's dad. In the process, they develop a strong bond of mutual respect and friendship.
Well, in many such fanfictions, the Weasleys might protect Hermione by using their magic skills. For example, they could create protective spells around her when she's in danger. They might also physically stand in her way when she's facing threats, like some dark wizards. And they would use their family influence in the wizarding world to keep her safe from any kind of harm or discrimination.
In such fanfictions, one reason could be Percy's ambition. He was often very career - driven and sometimes put his work for the Ministry above his family. This made the Weasleys, who were a very family - oriented group, feel neglected and thus blame him.
One possible reason could be a misunderstanding. Maybe there was a miscommunication about something important, like a plan to fight against the Dark Arts. For example, if the Weasleys accidentally left Hermione out of a crucial part of the plan, she might be very angry.
No, there should not be any such fanfiction. The 'Harry Potter' series has a well - established family and relationship structure. Hermione is Ron's friend and potential romantic partner, and having a sexual relationship with Ron's father in fanfiction is completely inappropriate and violates the basic understanding of the characters' relationships. It would be a perversion of the original story's themes.