I'm not gonna lie: it kind of sucks that a lot of SDV Fics and even Mods have instances where Demetrius is straight up abusive to Sebastian and people have coded actual divorce mods for him and Robin when like, canonically he doesn't do those things? He's painted so aggressive and it sucks. Like yeah, the game touches on his favoritism with his biological daughter, there is no doubt thats an issue and Sebastian laments this a lot, but I don't see why that means he also has to be cruel to Sebby, or like Robin would still be with him and just Let Him abuse her son? His scenes suggest like, at worst that he's incredibly oblivious and bad at communication, at worst he's no more flawed than other adults in SDV.
Which sucks even MORE because there actually IS a character who is seen struggling to be nice to their child - a few actually!- but specifically Pam, with ACTUAL angry sprites and topics of being harsh to Penny in her heart event (you literally can call her out on it if you upgrade their house) and while sometimes people can be nasty to Pam about it, I don't see nearly the same vitriol so like. HMM.
It'd be nice to see Demetrius and Sebastian interact more friendly, even if its awkward. Like, Demetrius of all people would probably understand Sebastian's job in programming and computer science given that one of his own main recipes is a Farm Computer and Maru ALSO dabbles in robotics. I'm positive that if he has any issues, it's because he thinks he ought to be more logical and not coding games, but still, you can address one form of bad parenting without making up another to add onto it lmao