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.
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.
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.
The neighbor situation could make their relationship more open. They would have more opportunities to see each other without the hustle and bustle of Hogwarts. This could lead to them sharing more personal stories. For instance, Harry could tell Hermione more about his early years with the Dursleys, and Hermione could share her experiences growing up as a Muggle - born witch. This sharing of personal histories would likely strengthen their bond.
Well, it makes their relationship even more complex. Ron might feel a bit left out at first because Harry and Hermione have this new, deeper connection. But then he realizes that it doesn't change their friendship. Harry and Hermione, on the other hand, might be more protective of each other than before.
The relationship between all three could become more complex. Hermione's bad treatment of Harry might make Ron more protective of Harry, causing a rift between Hermione and Ron as well. In the original series, they are a tight - knit trio, but in this fanfiction, the balance is thrown off. For example, they might not be as effective in fighting against the dark forces or solving mysteries together because of the tension.
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.
Their relationship would shift from a purely platonic friendship to a deeply committed partnership. Harry would become more protective of Hermione, not just as a friend but as the mother of his child. Hermione would see Harry in a new light, as a co - parent and a life - long partner. They would have to communicate on a different level, sharing not only their thoughts about the baby but also their hopes and fears for their future as a family. There would also be some awkward moments as they adjust to this new dynamic, especially in front of their old friends who are used to seeing them as just friends.
They could work together on a difficult task. By collaborating and seeing each other's skills and good intentions in action, Harry can regain his trust in Hermione. For instance, if they are in a dangerous situation and Hermione comes up with a clever plan that saves them both.
One possible storyline could be that Harry is sorted into a different house than Gryffindor and thus doesn't cross paths with Ron as much. He might form closer relationships with students from his new house, like Hufflepuff or Ravenclaw. This would lead to a whole new set of adventures and friendships for Harry that don't involve Ron at all.
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.