I doubt it was the Queen... because the anime ended way earlier than the manga and they changed a lot of things. I doubt the mangaka would tell them the actual ending (if she actually knew wat it would be at the time) for them to include it in the anime while ignoring the whole siblings thing and all the other background information we have been getting throughout the manga. Beside it would be an awful spoiler and I don't think any writer wants that... or at least I hope so, it would be terible boring if that was the actual ending beacuse it would mean that all of the last arcs (which are amazing) were actually useless in the plot... ( ̄へ ̄)
Was Tanaka stabbed at the end? DD:
And who the hell is so heartless and kills their family on their BIRTHDAY?!?!