Thanks to my older brother, I have depression and anxiety. Whenever he is in a bad mood, he swears at both myself and our older sister and throws things at us. He puts his finger up whenever he is told to clean his room or do his homework and he raises his voice, stamps up the stairs and slams doors. He is violent and has done similar things to our mum. He has threatened her whilst holding a knife, she called the police! Once he tried to commit suicide! On one occasion, I told one of my primary school teachers, when he found out, he swore. I don't know what to do anymore. I feel suicidal. It's much worse during lockdown, I feel like I can't escape. He wants to be a police officer... Is this domestic abuse? Please could you give me some advice? Is he mentally unstable?