Thank her for bringing this up to your attention and please report the peeping tom and the treehouse to authorities. I have a window in my bathroom, I'm sure if someone wanted they could watch. Most won't embarrass themselves by coming around and saying"hey close your window males in my family are sexual predators/perverts". Also, how did the wife find out? Did she join him up in a treehouse?

On my property, in my own house I can and am walking around naked. It is not my problem that neighbors have such a boring life they have time to track my movements in my own house. Shower curtains are stupid, and maybe they should put curtains in treehouse. And let's not take an issue that an adult man, stranger is peeping at a woman doing her normal stuff in her own house, the man is so weak to control his head and eyes to just not state and look. Naked body shouldn't cause any reaction, nudity isn't taboo, and nudity when in showers is expected and recommended. Imagine dad gives son life lessons how to become predator, and years later he thinks this is normal. It isn't. Looking into other people houses and stalking them through a window from a tree, treehouse, across the road is all illegal.