Bruh, your brother was poisoned and almost died, but you're worried about distracting your Dad from his duties. He was guarding the siblings and now that he's here, what happened to them? Did no one think of that? Also what kind of a dumb person would fall for an obvious ploy like that?
Also, I really hope they don't just forgive that Riolu guy. Doesn't matter if he has a sad story. Even after how well the siblings treated him, he chose to poison their brother. He could've just helped the imperial family instead of the Duke who treated him like trash. It's not like the Duke has any leverage over him. He just chose to follow him
The writing's been going downhill for a long time now.