yes, dio would be both. kidou is free to notice that dio only takes notice of him whenever it's convenient for him, otherwise he pays him no attention at all. he is also very good at doing things that make it look like he's the more reasonable brother - so for example, in front of the family, dio would be the good elder brother and will kick up the charm a few notches, but as soon as that's done, he's probably back to sneering and shitting at the kid.
i'm good with no traumas for now too! dio has no reason to escalate things, so we'll keep it to general apathy and casual meanness.
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yes, dio would be both. kidou is free to notice that dio only takes notice of him whenever it's convenient for him, otherwise he pays him no attention at all. he is also very good at doing things that make it look like he's the more reasonable brother - so for example, in front of the family, dio would be the good elder brother and will kick up the charm a few notches, but as soon as that's done, he's probably back to sneering and shitting at the kid.
i'm good with no traumas for now too! dio has no reason to escalate things, so we'll keep it to general apathy and casual meanness.