It used to be you could find a box of photos or keepsakes that you inherited to look back on how things were or when you were a kid. Now, most of that is stored on phones, and most parents probably don’t think to share or save them in a way to be passed down in the future.
I remember PhotoScan giving good results. It takes 5 photos for each photo (middle and the 4 corners) and mixes everything.
Not sure about the privacy aspect though, it’s Google after all.
Link: https://www.google.com/intl/en/photos/scan/