I don't know if you ever found out anything or not... I am also researching the name Kanniainen. I have a John Kanniainen born in Finland abt 1869 married to Hilda Kaisa Maki b. 21 Sep 1867 in Finland d. 9 Mar 1956 in Hennepin Co., Minnesota. I show children from this marriage as: Hilga or Hilda b. 1897, Jennie M b. 1902, Otto b. 1904, John Evert b. 1905, and Sonja Lydia b. 1908. All of the children born in Wadena Co., Minnesota. What was your gr-grandmother's full US name?