I'll start out by telling the state my family is.
I'm 18 and I live with my mother, aunt and uncle.
My uncle is the owner of the 3 roomed flat.
My uncle is 80% disabled-> unable to work and gets a crappy pension.
my aunts heart is ill. my mother is the only one with a decent job and paycheck.
The apartement I'm living in has been "under construction" for more than ten years and it basically looks like a dump.
I share the room with my uncle. He uses anti-depressants. he drinks a lot. the room i'm in has the shower in it - literally.
my uncle won't let anyone else to fix the flat.
We don't have any else relatives.
What to do to get a normal life ( except killing him )
Since the problem is that he is like a 12 year old. He does what he wants.