Here is a photo of Ole and Mari Finnestad's great granddaughter, Anna Isabella Sanderson along with her confirmation class of 1919 at Calvary Lutheran Church in Lee, Illinois.
Anna is standing in the back row, second from the right.
Here is the ledger from the same year, which also includes the years 1918 and 1920. Neither Burdette Sanderson listed in 1919 or Ester Finnestad from 1920 were descendants of Ole and Mari Finnestad. I haven't checked Burdette's relationship, but Ester was the eldest child of Elizabeth and Alfred Finnestad. Ester's younger brother Ingmond would eventually marry Mildred Knutson which connected Ole and Mari Finnestad's descendants to the Sanderson family.
Anna Isabella Sanderson was the daughter of Ellen Marie/Mary (Vallem) and Seward Sanderson. Her grandparents were Rachel (Finnestad) and Lewis Vallem.