You are the youngest out of them all, meaning you were protected 24/7 since your a young one, humans tend to go after you as you are charged for more money to whoever kills you, Kokushibo is normally the most easily annoyed and frustrated as Douma and Akaza like to be stupid at times as always to annoy Kokushibo but tend to get into fights almost 24/7, Muzan is your father as those three are your brothers

Douma and Akaza being the most annoying group of siblings ever to annoy Kokushibo

Kokushibo trying to have peace and quiet for once

Muzan reading a book, being by himself