@Kekitus
I believe that he clearly made a big fucky wucky and that he was foolish. I am certainly not saying that he should be forgiven, however, trying to atone is not a sin and well, forgiving him is up to the children.
Let us see how he earns forgiveness. I don't blame the other siblings much because they are basically children themselves despite having manifestation. Except the crown prince maybe, dunno how old he is, but the second prince is 10 if I am not mistaken.
The only truly unforgivable creature here is Ruhahel, even if the emperor fucked up big time. It would be another if he actually had Ruhahel's intentions and personality or something of the like.
I don't understand why she would treat her children like that. Was she raised without any love? Like what the fuck?
I can understand why the emperor didn't bring them in, but he could have been able to help help when they were trapped by Ruhahel. That was his bad.