This is a Real Photo Postcard from the antique shop in Moorhead Minnesota.

More than likely siblings. Note the smallest boy has lace up shoes instead of button shoes. President Roosevelt proclaimed the high button shoe out in 1933, when he saw it listed in the cost of living index. The children are all wearing heavy dark stockings. The boys both seem to be wearing knickers. The girls dresses have one shape fits all look to their dresses, they are both wearing strands of pearls and have bows in their hair. I wonder what the older boy thought of that stiff collar?
From Mrs. Nils Molkjer Mr Mrs.K. Torgersen
This is an AZO card with triangles up and triangles down in the stamp box, so we can date it 1918 to 1930.
Thanks for stopping by, do come again:)
Update from Iggy:
Louise Torgerson (b. April 3,1887 in Homedahl, Faribault, Minnesota - d. February 8, 1950 in James River Churchyard, Juanita, ND) married Nels Hans Molkjer (b: 1867) in 1909 and had a daughter from a previous marriage, Mabel Molkjer (b: 5 Feb 1907 d: Aug 1989), and with Nels, had Nels Molkjer Jr. 1910 – 1987, Ella Gina Molkjer 1912 – 1992, and Arthur Molkjer 1914 – 1982.
This very photo is in Ancestry.Com in several family trees. It is labeled (from left to right: Art, Mabel Salsbury, Nels Molkjer, Ella Molkjer).
Art, Mabel, Nels and Ella possibly taken in 1920 when their ages would have been.
Art 6, Mabel 13, Nels 10 and Ella 8