Amundsville is a township in McLean county. Which is a land area with several farms, not necessarily a town.The county seat of McLean county is Washburn, where the courthouse and legal information is kept, usually a county seat is the largest town in a county. You perhaps can get an obituary for either Carrie or Walfred Johnson from the Historical society, which should give you locations for the children.
McLean County Historical Society Vivian Merkel, Secretary P.O. Box 345 Washburn, ND 58577 USA