?

It seemed to me like the dad tried to bring up the topic to Shirotani and Shirotani wasn't having it. That may be why she got even bitchier at that point. I don't think the dad was ever aware that his relationship with a teenage student was abusive or that she was a narcissistic manipulator. I think he was happy to be getting some but didn't want to upset his son (and he never wondered why his son was upset by her). He seems to love Shirotani but he also seems kind of oblivious.

I'm kind of salty that the dad didn't notice that Shirotani was acting weird. He goes from constantly wanting to hold his father's hand on a hot summer day to staying several feet away from him. Wanting to eat whatever his father makes to not. Behaviors like washing hands and when his shoes were soaked he assumed he took a bath???? I guess they didn't show him giving concern, but even when Ueda yelled at Shirotani which he quite heard, he believed her when he didn't even want to eat the food anymore. I feel like he's a good Dad but just not paying attention to Shirotani. I really hope Sensei answers the questions I have though about him. I hope he is going to be brought up again soon T_T