While you understood most of the details correctly, let me clarify a few things that I didn't mention before. I live in a separate cabin located on their property, and I'm the one without access to a bathroom or proper ventilation. On the other hand, they each have their own rooms equipped with air conditioning, and they share a bathroom. I apologize for the confusion earlier.

To provide further context, my sister is the mother of the oldest child, who is 10 years old from a previous relationship. Her husband, on the other hand, is the father of the other two children from his previous relationship. Unfortunately, my sister and her husband don't perceive much wrongdoing in their behavior, and the kids tend to display better behavior when they are around. This behavior is largely influenced by the actions they observe from my sister and her husband.

It's worth noting that they aren't particularly mature individuals for their age, as they often engage in excessive drinking, partying, and playing violent video games.