Here is the obituary for Ole and Mari Finnestad's great grandson, Gordon Sanderson.
Gordon was the 13th child born to Ellen Marie (Vallem) and Seward Sanderson, (though the 14th child born to Seward Sanderson who had previously been married to Martha Cody).
Gordon's grandparents were Rachel (Finnestad) and Lewis Vallem.
I believe the marriage date is in error as the Winnebago county clerk's office has listed the marriage year of 1940. They also have listed Gordon as being 24 and Genevieve as 19 at the time of their marriage, though Gordon would have actually been 23 and Genevieve would have been 18 by September of 1940.