Axel Christiansen and Augusta Caroline Eriksen.
I found some informations about these two inhttp://www.politietsregisterblade.dk/index.php?lang=en
I enclose 2 images.
The first is issued in 1908 and they lived in Nansensgade 55
1 may 1909 moved to Schacksgade 1, where the 2 boys are born.
The next say: Udgaaet - means that they moved out of
Copenhagen police district.
20 april 1918 they came from Frederiksberg to Nørrefarigmagsgade.
Then they left Copenhagen.It does not say when.
The second image show that Axel Christiansen came back to
Copenhagen from Aarhus 1,december 1921 and that he was a
So Augusta Caroline must have died between 1911 and 1921.
Olga Anna Karla Christiansen who Paul found in the 1930 Cemsus was in 1916
married to Axel Christiansens brother Valdemar Christiansen.
They divorced between 1925 and 1928, when Valdermar married again
to Gerda Kirstine.They had a daughter Ellen born 1929.
In the 1925 Census Erik Christiansen lived with Valdemar and Olga in Falconer Alle 36.