He left the farm in 1946 to attend Calvin College in Grand Rapids , Michigan ; his mother and siblings moved to that city the following year .
Unable to attend high school , Rensenbrink took a correspondence course conducted by the American School in Chicago .
Rensenbrink left the farm in 1946 to attend Calvin College in Grand Rapids , Michigan ; Rensenbrink 's mother and siblings moved to that city the following year .
Unable to attend high school , Rensenbrink took a correspondence course conducted by the American School in Chicago .