Just a note: my trauma was childhood trauma, from a brother who terrorized me with strangely relentless continuous sustained attacks, pounding his fists into my skull while holding me down, as if trying to crush my head and kill me.
And my parents didn't know or chose to ignore it... so I lived in what felt like an unsafe environment. And I was also (undiagnosed) autistic... I didn't tell anyone of my brothers attacks, I was afraid to tell my parents, and my mother blamed me, the victim, in those instances she knew of when he hit me.
So any information that fits childhood trauma, sibling trauma, etc, as well as neglect from parents would be useful.