<human>: Can you give me the gist of the text in a nutshell?

Let's begin with some background information about my friend, "Kurt". Kurt is currently 17, and has an 18 year old sister "Natalia" (relevant later) a younger sister and an older sister [19]. 

When Kurt was around 15 his parents broke up. He bounced between living with his father and his sisters and mother, without a real place to call home. When Kurt was 16 his father died suddenly from a heart attack, this hit him really hard and complicated his living arrangements. He didn't want to live with his mother, and his not-so-nice sister Natalia so his girlfriend and her family were kind enough to allow Kurt to live in their house. This worked, and Kurt got on well with his girlfriend's family, better than he got on with her. A few months later the relationship between Kurt and his girlfriend weakened and they broke up. He still lived his his now ex-girlfriend's family for a few months after the break up, which only soured the remainder of their relationship. This is now where things get complicated. 

Kurt, Natalia and their mother bought a house. They all legally own this house, although K cannot technically do anything with the house because he is underage. Kurt, his sister Natalia and a roommate of Natalia live in this new house, his mother and younger sister live about 10km away. 

The house is used as the 'party house' by O and all of her friends. They smoke, do drugs, party all night loudly and have no respect for the house or Kurt and make no attempt to keep the house clean. It is mentally and physically a toxic environment for him to be living in. Kurt most of the time shuts himself into his room, attempting to distance himself from the almost constant party. I'm personally unsure how bad this house is to live in, I haven't been there however a common friend has and didn't speak fondly of it. Kurt has almost finished secondary school and will be at the house more regularly.

Kurt has had a few rough years, and his living conditions aren't helping, what can he do?
<bot>: Friend has had a rough few years and is currently stuck living in a house that he co-owns that is toxic to his physical and mental health