Many families have found themselves in the possession of a group of pictures that they can't identify. Over time, they become of no value to the family.
Nobody knows who the people in the picture are.
It is important for this reason, that you identify the people on your family pictures and write them on the back. Many of them could only have been identified by him. Find out where all of your relatives lived. Joe lived in Sycamore. Even if these pictures are never identified, you can assume that most, if not all of them are relatives.