The Yuzuki family's four brothers cherish each other deeply. Among them, the second son, Mikoto, dotes on Minato, the third son, while Minato, in turn, adores Gakuto, the youngest. 
[What is a brother complex?]
Was ist ein BroCon?
¿Qué es la hermanitis?
Qu’est-ce que le complexe fraternel ?
Cos'è il BroCon?
O que é "complexo fraterno"?