So are all of you not realizing something? The imperial [pure blood] children are more durable than a normal child. Like a LOT MORE DURABLE. And yet I see all of you people going "why aren't they able to treat the other two like normal children?!?!?!?!" ....because you goofs... since time immemorial in the history of the empire... ILLEGITIMATE HALF BLOOD CHILDREN WERE KILLED AT BIRTH! It would be obvious that none of these people know how to deal with actual children! They've never BEEN children that includes the Emperor himself! A "child" is like a completely alien life form to these people. They don't understand how fragile they are because well -points to the 10 year old who looks like he's 17- THAT is an average 10 year old in the royal family. I mean we're talking about a group of people that by the age of 10 look like adults. Have physical strength that goes to a level of superhuman. Oh also have a healing factor that would make WOLVERINE jealous. They don't realize that compared to the pureblooded royal family these two might as well be made of GLASS.
Also it shows that the 10 year old has been taught by their father that as far as blood ties goes. There is NO difference between "pureblood" and "illegitimate" in his eyes. Those are his children.. them being of pure noble blood is irrelevant and the fastest way to make him or any one of their elder brothers want to murder you is to act like there *is* one. Basically we're dealing with a family that doesn't understand how to treat "regular" children. It's going to be a long hard road for them to understand because they are too overspecced and should have been nerfed a long time ago.