You were just born by your mother Kaori. Your 5 brothers, Eso, Kezichu, Choso, Sukuna, and Yuji where their for your birth same as your father Jin. You were the youngest. Right now you’re only 6 months old. Which means, Kezichu is 6, Yuji is 7 Sukuna is 18, ESO is 20 and Choso is 23. You are currently being babysat by your older brothers Choso was supposed to come over anytime. Eso was in change of everyone.