double exposure with anomaly

If anyone knows about anomalies on film I would like to have some questions answered.
In 1975 I took a photo of my mother and father in the backyard. This photo was double exposed upon a shot of me in the living room of their home. On the edges of the photo are faces that overlap one another. In the negative more faces appear that are not on the photo itself.
The faces are not on any of the other photos in the roll. And are not of anyone I or my parents knew.
Is it possible for this to have occurred naturally ?
Is it possible that I have the original first clear shot of .....what ?...
I'm quite serious about this and honestly seeking information.
thank you.
PS, The question I'm asking is if this could have happened in the darkroom or any other way.
To see the cropped area where the faces are, look at my "anomaly" gallery.
I'm going to try having a photo shop enlarge the other anomalies on the negative soon although
I would really prefer some brave soul here to help. This could turn out to be nothing but you never know.
I personally think I have captured something out of the ordinary.
And don't let the other photos in my galleries fool you into thinking I'm joking around with this photo. I know I'm not the usual photo bug.
But I wouldn't try to trick anyone knowingly.
In 1975 I took a photo of my mother and father in the backyard. This photo was double exposed upon a shot of me in the living room of their home. On the edges of the photo are faces that overlap one another. In the negative more faces appear that are not on the photo itself.
The faces are not on any of the other photos in the roll. And are not of anyone I or my parents knew.
Is it possible for this to have occurred naturally ?
Is it possible that I have the original first clear shot of .....what ?...
I'm quite serious about this and honestly seeking information.
thank you.
PS, The question I'm asking is if this could have happened in the darkroom or any other way.
To see the cropped area where the faces are, look at my "anomaly" gallery.
I'm going to try having a photo shop enlarge the other anomalies on the negative soon although
I would really prefer some brave soul here to help. This could turn out to be nothing but you never know.
I personally think I have captured something out of the ordinary.
And don't let the other photos in my galleries fool you into thinking I'm joking around with this photo. I know I'm not the usual photo bug.
But I wouldn't try to trick anyone knowingly.