Exactly! No wonder the OG Cain behaves that way
Yeah, its weird that the parents don't know anything (except his obsession sis-con) about MC growth.
Such as MC's mother, it's really baffle me, she might be not caring about MC before the sister was born too...
She is a duchess. She must have a maid or nanny who help her attend the children's, no?
Yeah he its like they see him as the funny gag character in a game who suddenly in a hidden route only unlock by getting every ending turns out to be the deepest character of them all and secretly most involved with the actual plot
Its like they haven't unlocked his character content and instead of putting in effort to get to know him they were like
"Hahhahahaha funny gag character is a funny gag character" like wow congratulations meaningful human to human contact and engaging with other is clearly a choice for you
The mum herself admitted that in the carriage towards the palace that she / they never spoiled cain and "he is giving the love he never got towards his sister" and now with the duke being so supprised hearing from the teachers makes me think he never showed any interest in his studies or what he did literally like i just know the only reason is isnt a mega next level edge lord and hates his family is because he is isekai and didn't even see the duke and duchess as his parents like he still has his past memories