This picture took a little figuring out. The notes on the back say “Taken as they were leaving Preston July 7th”. The only Knickerbocker that I know of that lived in a city named Preston was Nellie Jane Knickerbocker, her husband Charles Snyder and their flock of children. They lived in Preston, Minnesota beginning about 1910. Nellie Jane was the second child of William and Helen so I’m going to say that this is a picture of William R. and Helen Burgess as they were visiting their married daughter sometime between 1910 and the end of summer 1915 when William R. passed away. So this picture is at least 99 years old ( or the original was – this is a copy I think).
I keep forgetting to add a little context to these pictures: William R. Knickerbocker and Helen Burgess are the parents of Clarence Knickerbocker. So, for me, these are my great-grandparents. I know for quite a few Knickerbocker descendents out there this would be a picture of your great-great-grandparents, and for some (say Bryana W. for example) these would be her great x 3 grandparents.
Here’s a previous post with William and Helen’s wedding certificate.