I need some help

I need advice or something. My house has gone crazy and the person who's in charge is the person tearing the house apart. This man came to live with us because we thought it was a good idea. Now he's thinking he's the big shot and the master of the house. He spends his money on beer instead of our food and food for our animals. I'm getting fed up with his attitude toward people with disorders like everyone in my family. My brother had his first big panic attack and this man tells my impressionable brother that he is using anxiety as an excuse. I can't live like this my sweet wonderful demeanor is gone I'm depressed anxious and aggressive as anything and there's little to no happy wonderful me left. How do I get over this? How can I get past all this by myself? Why doesn't anyone listen to me or help me? I really can't do anything with this going on my mental state is shot guys I just need some help some support something.