From what I understood he is not either of the brothers son but just a kid that looks like ml but I'm not sure if he is a guy in kids body that was brainwashed or the kid that was just brainwashed and that is overly intelligent
Spoilers...
Felix is Benedict's brother (as in wholly, sharing the same mother and father). If Im not wrong, he is older than he looks because of a condition that keeps him looking young (there is such a thing called Progeria); he was shunned by their father because on top of this condition, he also had a mental disorder (the bipolar thing i guess) so he was hidden and never met Benedict. Their mother loved him still and it was revealed that the portrait in the burrow was actually Felix painted by their mother. Felix inherited the mother's side wealth that's why he has some power. His real name is "Benjamin"
oh wowww that makes everything make sense as to who he is. At first I was thinking he mightve been benedicts twin who ended up being cast aside due to his disability since they look so alike. But overall it'd make sense he is related to him.
Bro who tf is Felix I still can’t pinpoint who he is. He looks like a kid but isn’t a kid orr? Or is he.. he talks as if Benedict is his brother sharing same mom and father. And even explaining things as if he witnessed it himself but if he’s a kid he couldn’t have. Unless he has some condition where he doesn’t “grow” and stayed looking like a kid. SPOIL ME PLS