No she is not becasue in the manga it said that Kaname was revived in the body of Yuki's real brother by Rido and Kaname himself said that he wished he had been born as Yuki's real brother
yuuki's not his real sister
although kaname is acted like the real brother but he was an ancestor that was revived by Rido.
that's why kaname was unable to kill rido
No...>_<
Well it all started out when Kaname saved Yuuuki.
So,they're probably just close friends as in BRO and SIS.
its all in the manga rly..It seems like they're BRo and SIS.
bUt just READ.
Plus Rido also took in Yuuki becuz of Kaname saving her.it goes around the chapter all over again~
So they raised her.Thats why everyone thinks that they're related.
But they're not BRO and SIS!!!!!!!!!!!!
How are ppl 100% sure about this...its sooo obvious...
How are they siblings?
Kaname saved Yuuki in the beginning.
Brought her home.
And the whole family raised her.>__<
Cross is also not her dad coz it says that she was adopted.
How can she be adopted if Kaname's parents are still alive?
She would be with them instead of Cross~
There siblings by blood but Kaname's soul and mind is of another. Imagine how old the dude really is
Kaname though wishes he was truly Yuki's brother in every aspect.