Hermione would likely throw herself more into her work. She might become even more independent and less likely to rely on others. This could lead to her making new friends and alliances within the wizarding world who are more in tune with her new single - minded focus on her career and causes.
Their relationship with Ron would definitely be different. Harry and Hermione being twins means they would have a lot of inside jokes and shared memories that Ron doesn't have. Ron might get jealous initially because they seem to be excluding him. However, as time goes on, Ron would realize that their bond as twins doesn't mean he is less important to them. He could then start to bond with them in new ways, like helping them with their twin - related magic or investigations.
The dynamic between Harry and Hermione would be completely different. Without Ron's comedic relief and his more laid - back nature, the story would be much darker. Harry would lose his best male friend, and this could make him more withdrawn or more determined to avenge Ron's death. Hermione would also have to step up in different ways, perhaps becoming more of a leader instead of relying on Ron's support. The overall tone of the story would be one of loss and melancholy.
Well, at first, it could be a bit of a shock for both of them and they might have some arguments about how it happened and what to do next. But as time goes on, they'd start to really bond over the idea of becoming parents. Ron would probably step up and be more responsible, and Hermione would see a new side of him. They'd have to support each other through the physical and emotional changes of pregnancy. And their relationship would no longer just be about their romantic feelings for each other, but also about building a family together. This would bring a whole new dimension to their relationship, with more love, but also more responsibilities and things to worry about.
They would become more protective of each other. Ron would be more vigilant about Hermione's well - being as she is now the mother of their child. And Hermione would be more understanding of Ron's insecurities as a new father.
The relationship could take a very different turn. Ron might become extremely jealous, especially if he has feelings for Hermione. This jealousy could lead to him lashing out at Hermione and even trying to drive a wedge between her and Draco. Hermione, in turn, might be frustrated with Ron's immaturity and start to distance herself from him. But if they are able to communicate effectively and Ron realizes his jealousy is unfounded, they could start to rebuild their relationship on a more mature and understanding basis.
The dynamic becomes very strained. Harry's lack of trust in Ron means that their usual banter and easy camaraderie is gone. Hermione will be stressed because she values both of their friendships. She may end up spending more time with Harry to try to help him through his doubts, which could make Ron jealous. Ron, on the other hand, might become defensive and start acting out, which only makes Harry trust him less. This could lead to a cycle of misunderstandings and a breakdown of their friendship triangle.
It would likely make their relationship more complex. Harry might feel a bit jealous at first because he had such a strong connection with Sirius. Ron, on the other hand, might be a bit confused. But overall, they would still be her friends. They might be more protective of her, especially if there are threats related to Sirius's past enemies. And Hermione would have to balance her new identity as Sirius's daughter with her long - standing friendships.
If Hermione was Harry's sister, the relationship between her and Harry would be more family - oriented. Ron might initially be a bit jealous as he has to share his two best friends in a different way. But overall, they could form a really strong trio with a new family - like bond.
It could become closer. Without Ron as a third party, Harry and Hermione might rely more on each other. They would have more one - on - one study sessions and adventures, which could strengthen their bond.
If Harry gives up magic, he'd likely move into the Muggle world. This would open up new storylines. He could start a new career in the Muggle world, perhaps in education or some other field. His friends from the wizarding world might visit him secretly, and there could be a whole new set of adventures based on the clash of the two worlds, like how he hides his magical past from Muggles and deals with the occasional magical emergency that still manages to find him.