User blog comment:Rrr2015/FEITAN...a Zoldyck?/@comment-5780397-20151110114649/@comment-5780397-20151110194329

I didn't mean it that way. What I wanted to say is that we can assume it's Killua Kalluto is talking about only because there are no other known brothers. The point is: what if he was referring to a half brother? It doesn't have to be Feitan.