This is child abuse. It doesn't matter if he was physically violent towards you, he was still violent and threatening. It would be verbal and emotional abuse. It doesn't matter that he was not legally (at least that is what i understood from the post- sorry if I"m wrong) your parent. He was in a custodial role because he was living in your house. You were a child. Hence it was child abuse. Domestic violence is among adults (of which there can be physical, mental emotional etc....) When a child is involved it is child abuse.

I'm so sorry this happened to you. I hope you are seeing a T to deal with this.