They might have a really close, protective relationship. His brother could be the one who always has Draco's back. Like when Draco gets into trouble with other students or is under pressure from the Death Eaters, his brother steps in to help him out, even if it means going against the family's traditional views sometimes.
It's possible that they have a strained relationship. Their personalities could be so different that they clash a lot. For instance, Draco might be more into following the pure - blood traditions strictly, while his brother is more open - minded and wants to break free from those constraints, which causes a lot of arguments and distance between them.
Well, they could have a very complex relationship. On one hand, they might be extremely competitive, always trying to outdo each other in everything from academics to impressing their parents. Since they are in Slytherin, they could also team up and be a formidable duo, using their combined wits to get what they want in the wizarding world. Maybe they have a secret pact to protect each other no matter what.
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.
Well, they could have a protective relationship. Draco might be very protective of his little sister, shielding her from the darker aspects of the wizarding world he's involved in. For example, if there are threats from other wizarding families or the general chaos in the world, he'd stand up for her.
If Harry were Draco's older brother in this fanfiction, their relationship at Hogwarts would be a total mess - up of the original dynamic. Harry would be constantly torn between the Gryffindor values he adheres to and his family bond with Draco. Draco might start to question his Slytherin - only ideology because of his connection to Harry. For example, they might find themselves in situations where they have to choose between their house loyalties and their new - found brotherly bond, like during the Quidditch matches or the Triwizard Tournament.
At first, it could be strained. Draco, being used to being the only son in the family's eyes, might feel threatened by his twin. He could be jealous if his twin shows more magical talent or is more popular at Hogwarts. But as they grow older, they might start to understand each other better. For example, if they face a common enemy, like a bully from another house, they could come together and realize the importance of family.
His brother could introduce new alliances. If he's more friendly or has different views from Draco, he might make friends with characters that Draco wouldn't usually associate with. This could lead to new storylines where Draco has to deal with these unexpected connections.
Towards the end, their relationship could become a very strong and unique one. They could be each other's closest confidants, with Harry being the one Draco turns to when he has doubts about the pure - blood ideology, and Draco being the person Harry trusts to keep him safe in the Slytherin common room. Their bond would be a mix of brotherly love and mutual respect.
In the fanfiction, they could have a very protective relationship. The brother might always be looking out for Hermione, especially in dangerous situations at Hogwarts. He could be like a secret guardian, using his own unique skills and knowledge to keep her safe.
They could have a really complex relationship. Draco would be protective yet also have his Slytherin pride. Harry might look up to Draco in some ways, like for his knowledge of the wizarding world. But they could also have their disagreements, especially when it comes to things like blood purity. However, at the end of the day, the brotherly bond would still be there.
It could lead to all sorts of interesting plot twists. Maybe there's competition or a stronger bond between them.