I turned out to be one of the freaks of the world because I am a very clean person. Probably got some of my moms "OCD" genes.
But for as long as I can remember, whenever I left a dish in the living room, or a dirty dish in the sink, It would end up in my bed. That only happened a few times but damn did I learn from it.
I never recieved an "Allowance", I was told if I did my chores I got a bed under my a$$ and I could eat the dinner that someone made insted of having to starve or make it myself, usally the first.
I'm only 21, but I have been forced to be a clean person as long as I have been alive.
My parents were tough and harsh and at times I wanted to go to social services and say I was abused just so I could go live somewhere else. But for the last 4 years I understand why they were so harsh and I truely appreciate it. Especially whenever I went over to a friends house and saw the disgusting mess they lived in.
Don't be afraid to let him know YOU are the parent and he lives in YOUR house. Put the fear of "God" into him, let him know who's boss.