Is there any way to get a restraining order against someone with anger issues?

My brother, 21, has been going through episodes of anger (throwing, breaking things, in his room). I had to report him the first time due to him pulling out a knife at me and my family. He was yelling and screaming. He wanted to hurt us. It has gone out of control. This recently, I had an issue with the same outcome when I heard him swearing and yelling in his room and starting to break things. I had to dial 911 when I heard that he was going to hurt himself with a knife and made fake gargling sounds as if he had already did something. The police arrived and in the end, the officer told me he was only rage quitting a game. Keep in mind that he has a very unhealthy addiction to videogames which I believe causes him to be so violent. I cannot take this any further. Whether he has an issue with anger or videogames, it needs to stop. This is my second time reporting to the cops and I need answers. I fear for me and my family’s lives every day because I have become traumatized with what he is doing in this house. He's destroying this house. My parents had a fair share of warnings from him and it seems they do not want to participate in getting him the help he needs. Will a restraining order work? I want him out of this house to get help. I am the older sister, 23.