Are we going to see the parents again? I guess it would make sense to see the father, since he might come for his son, but does the mother have any reason to show up?
You'd think his mother would give the slightest bit of attention at least once a year!
Neglect isn't something you turn off unfortunately.
Poor kiddo. Screwed over by the parents every single time. No wonder he turned so rotten before the reincarnation kicked in.
He wasn't even that rotten, apparently. Even with no figure of authority to correct his behaviour, it seems he didn't have any truly bad personality trait (e.g. cruelty) to correct. It also seems his tantrums were mostly fueled by physical discomfort and that he just ate because his life was mostly empty (his only interactions were with servants and he couldn't get out of the house). To be fair, he was still very young so he never really got to understand the position of power he was in nor abuse it too much.
Good thing he got the memories from reincarnation; he was on a bad path due to his circumstances.