Exactly, fren. Japanfag here. Married to a J-girl for nearly 22 years, and we have a daughter who is now 14. At my wife's insistence, I showered with my daughter weekday nights up until maybe she was... 9 or 10. Can't remember. Nothing sexual at all. No hard-ons, I never touched her kooch, etc. In fact, it was a nice time I had with her each evening to ask her how her day at school was, about her friends, her classes, etc. We had fun. Nothing weird at all. Then as she became an adolescent and started becoming... pointy up top, it was her decision to take showers alone. That was her decision.

There should be no problems with this sort of thing. My friend from Mexico said he would shower with his mom when he was a kid. In European countries in which family nudity is not taboo, it provides a window for children to ask questions and learn about life. Consequently, those kids don't end up pregnant before graduating high school.

In terms of Ashley Biden, IIRC the context implied that Mr. Sniffy was forcing her to take showers with her, and he probably had a raging hard-on. She was sexualized. He was likely forcing her into sexual acts. Anyone who compares what Mr. Sniffy did to his daughter to what is standard here in Asia is ignorant AF.