Among oldemor's photos, there were a few that were very old and intriguing. Some of them we still haven't really identified. But some of them were in fact childhood photos of oldemor's parents, my great-great-grandparents, and their siblings.
Oldemor Gerd was the daughter of Sofus Adolf Hansen, who was born in Oslo in 1898 and died in 1970, and Dagny Gunvor Andreasdatter Hellerud, who was born in Blaker in 1901 and died in 1983. The majority of the very old photos seem to come from Sofus' side.
Believe it or not, the photo above is Sofus' class picture. It must have been taken around 1905, and the location is Sofienberg School. Sofus is almost certainly number 4 from the left in the third row from the front.
There is, of course, nobody alive today who remembers Sofus as a young boy. The photo below is from his final years at the sailcloth factory, and shows him as the older man that his grandchildren and great-grandchildren remember him as. I believe the photo was taken sometime in the 1950s.