Christoph is probaby half-brother and an illegitimate child of their father. His mother was probably a servant (although, the status seems similar to slavery to me). It was mentioned early on Christoph was of <royal blood> and since he has a core, its quite potent in him, regardless, he’s still born a <servant>.
I’ll correct myself, Christoph is mixed blood, but we’re not sure if he has a core. src: ch 14.
There's still a lot we don't know. :(( We don't know 100% what kind of people exist within Intron. I think there was a general assumption among readers that Intron consists of servants, since the organization did not want the Selvior family to create a cure to the VS solution. It's normal for royal bloods to be mixed blood; not all royal bloods are 100% just royal blood in DNA like the Selvior family. It was just sad to see poor Christoph mistreated, whether if it's due to his blood or anything else... ┗( T﹏T )┛
WHAT??!! CHRISTOPH IS EDWIN'S STEP-BROTHER?? WHY DID CHRISTOPH GET MISTREATED?? What the heck is Ryan and Edwin's relationship?? Is Ryan okay?? ;-----; How is Lucaon back home??? OMG, Cecila, come back safely with Ryan, please. <33 (Btw, Cecilia was a BADASS for carrying Kyon out that window <33) I feel sorry for Christoph ┗( T﹏T )┛