Memories. Mind Over Matter?

When I was three or four years old, I was playing in the sand outside the three-decker house I lived in. It was a nice sunny day, not a foggy day, or rainy day, or dark day, but a clear warm day in Jacksonville, Florida, and I was playing in the sand with another boy, a black boy. I remember this distinctly. There is not a shadow of a doubt in my mind. My parents say it never happened. In 1949 or 1950 it would have been highly unusual. But I remember it. Did it happen? Or is my mind playing tricks on me? Am I confusing one thing with another? Am I merging memories that have nothing to do with each other? Is this an example of mind over matter? The logical person would say, 'Richard, it never happened'. A more imaginative person might say it did happen. I consider myself both logical (with some fallacious thinking along the way) and imaginative (I write fiction, after all). I say it did happen. How do I know? I remember it.