Responses

You don't need to worry about that. From how I understood the story, his cousin is the only family member that treats him nicely, so he has a massive attachment towards her. Her getting married means no longer living in the same house, etc
Although I could be mistaking this for something else, it's been a while. Again, dw bout that, he switches over to Lee pretty quickly in the story, I don't remember anything weird from this apart from Yuri's obsessive tendencies
Help a fella out, please explain up to chapter 22 cause I am not understanding this?? He likes his adopted sister who’s his cousin? I’m so confused help