@essam I think it is both of them (and also Chi) that make the family this way. Also, I think that Nishikata’s charm, outside his general dorkiness, is his kindness. It’s what made Takagi interested in him in the first place (the handkerchief incident from their first meeting). I just mentioned the father in my last comment because he is the focus of this chapter. I also mentioned him because I like men and would love to have a partner like him. It’s not like I hate Takagi or anything.
I am not sure I entirely agree with you here, but I respect your opinion nonetheless.