Through Slashdot.org, I went to a website, Twins or Not, uploading several sets of photos for analysis. I assume that the website uses photo-metrics, so I tried to upload sets of photos showing the people at roughly the same ages. (This wasn't possible for the younger generations - using the electronic files that I have on hand and found, easily.)
Bottom left, Dudette, Paternal Grandmother, Granddaughter
Don't ask me how Dudette and Bogie can be a 100% match (clones!), but Bogie resembles our granddaughter more than Dudette (Granddaughter's mother) does.
I don't show the photos but the analysis reported an 18% match between Hunky Husband and his father, which doesn't at all agree with observation by a human. Since my grandmother and Mother were related by marriage, the 86% match is astounding. My own best match by the program was to Elder Brother at 80%. I did note that a person's photos without eyeglasses produced slightly better results than with eyeglasses. I need to find a good photo of Dudette without her glasses.