In 1910, Ole and Mari Finnestad's grandchild, Ole Alfred Knutson resided at the Watertown State Hospital in East Moline, Illinois. Ole is listed as entry #60 (10th down).
Ole Alfred was the son of Elizabeth and Ole Andreas Knutson.
The Watertown State Hospital for the insane opened on May 16, 1898. You can read more about the institution here.
Here is what Watertown State Hospital looked like.
In 1900, Ole was living still living with his family, so he was admitted to the hospital sometime between 1900 and 1910.