Well, they'd be closer in a more family - like way. In the original, they're good friends, but if raised together, they'd have that sibling - like bond. They'd probably be more protective of each other right from the start. For instance, Harry might not be as hesitant to ask Hermione for help as he sometimes was in the books, and Hermione would be more likely to mother - hen Harry.
In the original series, their relationship was based on mutual respect and shared adventures at Hogwarts. However, in the 'Harry and Hermione raised together fanfic', they would have a deeper emotional connection rooted in their shared upbringing. This could lead to a more complex relationship where they not only rely on each other for magical matters but also for emotional support. They might have inside jokes and memories from their childhood that no one else understands, which would further strengthen their bond and set their relationship apart from what we saw in the original books.
In the original series, their friendship was built on a foundation of trust and common goals, like fighting Voldemort. In a married fanfic, that trust would be even deeper. They would be more involved in each other's daily lives. For instance, Hermione might be more involved in Harry's Auror work, giving him advice on how to handle certain magical cases. And Harry would be more involved in Hermione's efforts in the Ministry of Magic for the betterment of the wizarding world. Their relationship would be a blend of love, friendship, and partnership, which is different from just the friendship they had before.
They could become even closer friends. After going through the war together, they have a deep bond. Maybe they start to rely on each other more than ever, sharing every little detail of their lives.
It would likely cause a great deal of strain. Harry would probably feel betrayed and angry at Hermione. Their friendship, which was once strong, would be severely damaged.
In the original series, their relationship was mainly defined by the house divide and their different loyalties. However, as demigods, a whole new dimension is added. They would have to put aside their old grudges because they are now part of a different world with different rules. Their relationship could become a friendship built on mutual survival and the understanding of their demigod natures. They may even find that their differences as a Slytherin and a Gryffindor are assets when dealing with the various tasks and threats that come with being demigods. Their bond could grow as they explore their new powers and face challenges that only they, as demigods, can understand.
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.
They would become more reliant on each other. Their relationship would shift from just being friends to co - parents. There would be a deeper level of intimacy and shared responsibility.
The relationship between them can be a journey. Initially, there could be some envy or misunderstanding due to the house differences. Maybe Harry envies the academic resources Hermione has in her house, or Hermione doesn't understand some of the Gryffindor bravado. But as they interact more, they learn to appreciate each other's strengths. Harry might admire Hermione's ability to think outside the box of Gryffindor norms, and Hermione could come to respect Harry's leadership skills that are so characteristic of Gryffindor. This new - found respect and admiration transform their relationship into a more profound and unique friendship.
Their relationship could become deeper. Meeting Hermione's relatives would mean Harry is getting more involved in her personal life, which might make them closer. They would share more experiences related to her family, and this could lead to more understanding and trust between them.
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.
The dynamic would be different. They might be more like co - conspirators in a magical adventure that starts before Hogwarts. They could be more secretive and have a special bond that the other students at Hogwarts might not fully understand. This could lead to them being more isolated as a duo, but also more reliant on each other.