Uke looks like his mom, illegitimate who?

I think she was a mistress maby??

I think he inherited so much from his mom, and so less from his dad, that the family can't believe that a woman's gene dominated theirs.
And here comes a question: dns test??

I mean, if that can't be the state then she had to cheat. What she didn't if I know right

you mean the mother or his "real" mother? because the mother is their dad's legit wife I believe, I mean he even has her pictures plastered all over the room and others recognize her as his wife too. If it's his "real" mother tho, it's still unlikely coz the father claims to love his wife, so what would be his reason for cheating? drunken mistake? political/business transaction?

you'd think so right? but there was a panel where he says he stands out because people from their kingdom has a typical look (olive skinned) which is proven by both the parents, even that butler bottom who wanted to sleep with seme, and heck even his turmeric-tinted bro falls within this description; it's really just his pale skin that's the issue, like if neither parents are pale, where did he get it? you might argue that it's recessive but both parents are local citizens too so eventho that's possible, it's still unlikely.

My bet is on his real mom/dad being the mother's relative who did it with some foreigner and then had to run away for some plot reason- this would explain why he still has the resemblance to her but at the same time he doesn't look local; but who knows, maybe one of the parents really did cheat?

Yeah, but like if some grandma or grandpa was "white" it would explain too. And as I understood, mom died, seo appeared. Like, mom died while giving birth, or not so later...
But that's not adding up too well.

Last thing is mom went away to do something, was raped, and had a child... but this is really just imagination

I think you're misunderstanding, as I did too for a bit because I too thought it's the mom who had him with another man, but the plot actually leans on the father having him with another woman, which is why I said it didn't make sense to me coz uke looks like the mother and the father loves his wife anyway, so what gives? Also if you read the most recent chapter, it said he was brought to the estate AFTER the mother's death, so if she really did carry him, then he should've been born at the estate in the first place + the bro should address her as "their" mother not just "his (bro)" mother if that was the case.

Then since he looks so much like his mother maby it's a sister that he slept with, like the wife's sister?

I'm pretty sure it’s a misunderstanding and he is their real child.