This is definitely not normal behavior. Being naked all the time in public or inappropriate situations goes against social norms and basic propriety. There could be some underlying issues like mental health problems or a lack of proper upbringing. But in any case, it's concerning and should be addressed properly.
There are situations where it could be seen as appropriate, such as in some forms of art or certain spiritual retreats where nudity is a part of the practice. But if it's just casually in a normal living situation or in public areas, it's not considered appropriate at all. It's crucial to respect the feelings and boundaries of not only yourself and your friend but also of society at large.
First, it's important to respect her privacy and the family's boundaries. If it makes you uncomfortable, you could talk to your friend privately about how you feel. Maybe he can address the situation with his sister in a gentle way.
This is a very delicate situation. You need to understand that it was an accident and not something you were seeking. It's important to respect her dignity. You might also want to consider if there was any way you could have avoided seeing her in that state, like knocking louder or waiting longer before entering a room. In any case, keep your reaction calm and respectful, and don't let this incident create unnecessary tension or discomfort in your relationship with your friend or his mom.
You could try to find humor in it in a very private way. For example, think about how it was just a crazy, unexpected moment. But again, don't share this humor with anyone else. Also, remind yourself that it was an accident and that everyone has embarrassing moments sometimes. This can help you feel less awkward about it.
This is a rather strange situation. If it's about inappropriate clothing, it might be that she has a different sense of fashion or self - expression that others find a bit too much. But it's also important to respect everyone's choice as long as it's within the bounds of decency.
Well, it could be normal in the context of personal preference. If the mom is in a private and safe sleeping environment, sleeping naked might be her choice for maximum comfort. But it's also important to note that in a family setting, especially if there are children around, appropriate boundaries should be considered.
First, immediately turn away and give her privacy. Then, apologize sincerely but briefly without making it overly awkward. For example, you could say 'I'm so sorry, I didn't mean to.' Try to avoid bringing it up again in the future.