My stepmother was very controlling, my father not so involved with me after he married her. So, whenever I tell my story to a new therapist, the first thing they say, is (as the one last month did), "You didn't mention your father." I have a clear memory or two of my father from when I was 4, my father married my stepmother when I was 5 :-) but didn't die until I was 42.

Is it possible someone came into your life after this person you can't remember and had a more forceful personality or that the person you can't remember receded in your life in some way?

Another thought. I'm the youngest of 5 children and remember less that is significant as I became older because the "action" of all of us was leaving, which left me more on my own with my parents and I retreated more into my room and self. So, I have extreme memories of my stepmother because we were often battling with one another, I felt beseiged by her, but not so many other ones because I was by myself more and not "participating" in anything. If you just had a "vanilla" life, weren't outgoing and doing much but didn't particularly have any trauma, you might not remember much because there's not all that much significant to remember. If you've been depressed forever, for example, what's to remember? Each day is pretty much like every other?