They'd likely have a complex relationship. At first, they might be at odds because of their different initial beliefs. Draco's brought up in a family with pure - blood - centric views, while Hermione is a Muggle - born who believes in equality. But as they grow, they could start to understand each other more. There could be a lot of sibling banter, with Draco teasing Hermione about her Gryffindor friends, and Hermione pushing Draco to be a better person.
Their relationship would be a mix of rivalry and love. Given their different house allegiances, there would be competition between them. However, deep down, they would have that unbreakable twin bond. Hermione could introduce Draco to the world of Muggle - born magic, which would be eye - opening for him. And Draco could protect Hermione from the more bigoted Slytherins. In the end, they would probably be each other's confidants, sharing secrets that they wouldn't tell anyone else, despite their outward differences.
She would have a very close relationship with them. Since she is Lily's twin, James would be her brother - in - law. She would be like Harry's aunt. They would have likely grown up together, and Hermione would have been part of the family. She would have been there during important family moments, and her relationship with James and Lily would be based on both family ties and mutual respect for each other's magical abilities.
It could be a relationship full of secrecy. Since Hermione is a Muggle - born in the eyes of most of the wizarding world and Narcissa is from a pure - blood family. They might have to keep their sisterhood a secret to avoid scandal. They could communicate in hushed tones and have secret meetings, slowly building a bond based on mutual understanding and the fact that they are family despite all the differences.
She could be really kind. In contrast to Draco's sometimes haughty attitude, she might be the one who is always helping out the first - years, showing them around Hogwarts and making them feel welcome.
Well, Hermione being James' twin sister would make her and Sirius have a tight - knit relationship. Sirius would be part of her family in a way. He'd be there for her during her Hogwarts years, and they could bond over their shared love for James. Sirius might also teach Hermione some of the more secretive and dangerous spells that the Marauders knew, and Hermione would keep Sirius in line with her logical thinking and rules - following nature, creating a balanced and loving relationship.
Well, in the fanfiction, they could have a very close relationship. Maybe they protect each other from the dark forces at Hogwarts. They might share secrets that no one else knows, like about their family's hidden past or their own personal fears and dreams.
She could have a very different relationship with Harry. Instead of being just friends, she might be more like an older sister figure, using her family knowledge to guide him. With Ron, their relationship could be more complex. Maybe there would be some jealousy from Ron as Hermione would have a more prestigious family background. And with the other members of the Black family, she would have a family bond. Some of the Black family members who were against Voldemort could be her allies in a more personal way.
It would be really complex. Draco would probably be initially very confused and maybe a bit resentful. He's been brought up with certain ideas about pure - blood superiority and Hermione being a 'Muggle - born' (in the original context). Now, if she's his aunt, he'd have to re - evaluate his views. He might also be jealous of Hermione's intelligence and the fact that she doesn't conform to the Malfoy family's more rigid ways.
Her twin sister could be really outgoing. While Hermione is often seen as a bit reserved in social situations, the sister could be the life of the party. She might be more interested in Quidditch than Hermione and be a great flyer. Also, she could be more impulsive. Hermione thinks things through carefully, but the sister could be the type to jump into action without much planning.
They could have a very protective relationship. Hermione, being a witch, would likely feel responsible for her sister. She might be over - protective, always making sure her sister is safe from any harm that could come from the wizarding world.
Their family life would be quite complex. There would be a clash between Hermione's values, which are more in line with equality and fairness, and the traditional pure - blood values of the Malfoy family. However, they might also find some common ground, like their love for magic. Draco's parents would likely have a hard time accepting Hermione at first, given her Muggle - born status (assuming that aspect remains the same). But over time, they might come to appreciate her intelligence and abilities.