Of course they are but its the tuz, what do you expect? There's nothing wrong with his affection for his sister, it's never been brought up as weird or anything like that. And why should it?
And somebody seriously asked if it's a cultural thing? I mean I know more the most here the bad side of the Brazilian culture can be pretty bad and I despise most if not all of it but incest was never a part of it. It hurts my eyes to read such ignorance and elitism like Europeans aren't fucked up either. Wake the fuck up, humans are fucked up no matter the nationality.
Just because the catholic church in Rome and pedophiles go hand in hand and it's based in Italy I'm not going to assume all Italians are pedophiles.