I guess this is Marie in 1910 with her children Jenny and Olehttp://digitalarkivet.arkivverket.no/ft/person/pf01036389001...
..and Ragnvald? http://digitalarkivet.arkivverket.no/ft/person/pf01036389001...
The Ragnvald I found in 1910 could be Ragnvald Kopperud I found buried in Oslo. His mother was living at Kopperudstuen in 1910.
DIS Gravminner/DIS Cemeteries in Norway, http://www.disnorge.no/gravminner/index.php?language=engelsk
Ragnvald Kopperud, born 9th of September 1894, died 25th of January 1968, buried at Nordre gravlund, Oslo, square 17; row 8; grave no 11-1
The grave next to his is probably his wife buried:
Margit Kopperud, born 13th of July 1905, died 7th of July 2002, buried at Nordre gravlund, Oslo, square 17; row 8; grave no 11-2
A few Jenny's born 4th of October 18 are popping, this is one possible candidate buried in Akershus
Double click on the link, http://www.disnorge.no/gravminner/bilde.php?id=3100000
There is one Ole Sydvold born 21st of July 1892 buried at Holter, Nannestad,
Double click on the link , http://www.disnorge.no/gravminner/bilde.php?id=2211974