I believe I have scanned everyone of my negatives and slides as well as all my dad's.
I have a master spreadsheet summarising the films. Confusingly it is divided into three groups; New System, Old System, No System.
I can't explain in full detail what this means. To cut it short, New System contains more current pictures and scans, Old System very old negatives (when I used to record the exposure details for each film, lost the notebook ages ago) and No System, the rest. Basically it is the next best thing to absolute chaos.
To make it more confusing, the New System records are mixed up with my digital shots. The other two sets are film exclusively.
To say, definitively, how many films I have is almost impossible. Seeing that, in total, the number of archived images I have is about 60,000, I can't honestly claim that more than about 40,000 are my originals. Of those maybe only 25,000 from film. That's taking into account quite a few found images, film, slide and print.
I give periodic copies of the galleries to my sons every now and then as I'm unsure what will happen to the physical files.
I've also created a few albums of prints, both film and digital.