Here's the explanation from Flickr:
I found the negatives for these pictures in a box of darkroom items at a garage sale 15 years ago. I have been haunted by them ever since. I have scoured these pictures looking for clues as to the identity of this family. Now I will ask my Flickr friends to help.Here's the photoset. Better than the photoset is the slideshow at this link (if you're interested, I recommend clicking here rather than on individual thumbnails in the former link). These are very high-quality photos for the 1940s
Here's the Reddit thread, where some of the locations in the photos have been identified.