He’s your little brother.

you had always been the one to take care of him, even though you were only 6 when he was born. You had o grow up fast, to make sure he survived, because everyone else in the Zen’in clan hated him. They thought he was useless, because he had…an absence of cursed energy. Though you could see that he’s strong, even if he can’t be a Jujutsu Sorcerer.

though he was always bullied, because of his inability to become a Jujutsu Sorcerer.