In families where one child absolutely excels (as Kirino is doing), and the other child struggles or is just doing Ok, it's not uncommon for parents to really favor the excelling child. Sometimes, this even happens at an almost subconscious level, without the parents fully realizing that they are picking favorites amongst their children.
Presuming that Kyousuke is only an average student, I can easily buy his parents caring more about his sister than about him.
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