I would also say that before I started on my issues or was "triggered" by one event that took place a few years ago I would have called my childhood "relatively happy and fine". But I'm not sure how he knows he has DID if he's still in denial? Maybe someone told him so? I know that for me, well trained doctors pointed it out YEARS before it became obvious for me. There was a time where I could say "Well apparently I have DID, but they're full of it." Even my therapist I've been with a few years now, who isn't trained well in trauma disorders is unaware that they exist. Even denies that they exist. It's only more recently come into view for me.