It could be that the parents feared for the twin's safety due to some ancient curse or a threat from a rival family. Another possibility is that the twin had a special ability that needed to be hidden from the wizarding world at large.
Perhaps Draco's family was trying to avoid a power struggle within the pure-blood community by keeping the twin away. Or it might be that the twin was marked by a powerful magic that could cause chaos if revealed too soon.
Maybe it was a family secret to protect the twin from some dark force. Or perhaps there was a prophecy involved.
He could be resentful at first. After all, his parents have kept this big secret from him his whole life. But as he gets to know his twin, he might develop a sense of brotherly love. He may also start to question his family's values and actions in hiding his brother, which could lead to a change in his own character.
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.
Maybe the twin brother has a special power that Draco doesn't. For example, he could be a seer like Trelawney but more accurate. His visions could show him the future of Hogwarts and the wizarding world during the dark times of Voldemort's return. He then tries to use this power to prevent bad things from happening, but Draco is suspicious of his actions and tries to stop him, thinking he's going against their family and the Dark Lord.
Currently, there were novels that mentioned that the older brother snatched the younger brother's food through the iron cage. They were "Brother's Cage (Pseudo-Bone 1v1)" and "Bojun Yixiao) Prison Pet (Orthopedics..." <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
It could lead to all sorts of interesting plot twists. Maybe there's competition or a stronger bond between them.
The twin could change a lot. He might be the one who stops Draco from making some really bad decisions. For instance, if Draco was about to follow Voldemort's orders blindly, the twin could convince him otherwise. This would then change the whole course of Draco's actions and how he interacts with Harry Potter and his friends.
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.
A few novels to recommend: 'Destined Love' was written by Feng Yirou in ancient words. Modern girls dressed up to become official lolis in ancient times. They had a handsome brother but disappeared halfway. They met a blood-stained handsome boy and their fake brother (sister) was in trouble. In their previous life and this life, their brother doted on them for a short time. Later on, the brothers became husband and wife. The love was sweet and there was light abuse. The plot was coherent and not stiff. "The All-powerful Time Traveler's Sister" was Sun Jiuniang's fantasy romance. The elder sister was omnipotent and the younger sister was incompetent. The elder sister was powerful and knew many men, so the younger sister had many older brothers. "About Me Becoming a Younger Sister" was a light novel by Luo Xiaomo. The souls of the siblings swapped. The male lead, Luo Zijing, was a 16-year-old Sagittarius narcissistic and loved to complain. The female lead, Luo Xiaoyou, was a 16-year-old Aries who looked cute on the outside but was eccentric on the inside. There were also female supporting characters such as her best friend, Muyu. The story was super interesting. 'The Youth of the Daughter of the Time Traverse', an ancient saying of flowing water forming a wine cup. After the female protagonist transmigrated, her father did not dote on her mother, but she was very smart to seek her own beautiful life. "Raising Sister-in-law through the Book 80", a modern romance written by Qingyue. The 1990s and the 1980s were all orphans in the countryside. They had to support their younger siblings and had a child betrothal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
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, 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.