Jujutsu Kaisen Season 2 shows that Choso and Yuji are brothers as the former recalls a distant memory – but is there any truth to this?
Jujutsu Kaisen confirms Yuji's unexpected technique - Dexerto
Jujutsu Kaisen: Are Yuji And Choso Brothers? - Anime Explained
Will there be a Jujutsu Kaisen Season 3? - Dexerto