True, but I think that he'd forgive to have one of his children back. And I know his Family is Chachi's idea that you just adapted, but she made it seem like Kita was the only other heir, since she was the princess Edmond was raising for the throne, and why he found a mate for her and was so upset she left. If you intended for Kito and Kita to have more siblings, neither of you have shown that. If if she's doing like real life monarchies, then Kita would only have been the heir if she had no other brothers. You know, kings before queens.
I'm sure if you ask Chachi, she'll allow you to use her idea since you've already implemented it as Kito's backstory. If its canon, I don't see why you can't use it for your story. But it's just an idea, so you can do whatever you decide.XD