Hugs, TR. One of the things I have realized is that I may never know the exact truth about my past. What I can know is what I experienced.
There was neglect/abuse to the extent that I developed parts to deal with it.
Parts don't just happen, dissociation doesn't just happen. Trauma causes dissociation.
I dissociate, therefore I was traumatized. The exact things that happened may not be clear, but that one fact is indisputable.