1900 Olive, St. Joseph, IN
John Kolacz, b. Poland, Germany, Aug 1839, M19yrs, farmer
Hellen, b. Poland-germany, Sept 1855
Both of John's parents were born in Poland, Germany. You'll have to look at historical maps for 1839 to find what was considered Poland-Germany.
You should look for his 1870 immigration record. Generally they have where the person was born or living before they left for the USA.
Their parents names will be on their death certificates if the Informant knew their names.
Born: Jan 23, 1855, Poland
Father: Lawrence My? [can't read; look for DC on Ancestry; maybe you can decipher], b. Poland
Mother: born Poland
Spouse: John Kolacz
Res: RR3 & New Carlisle
Informant: Albin Kolacz, RR3 & New Carlisle
Buried: St. Joseph Cemetery, Oct 28, 1931
I'd contact the following to find her obituary. Sometimes the parents names are included in the obit.
St. Joseph County Public Library, http://sjcpl.lib.in.us/family-history
Vincent Bendix Research Library Archives, www.historymuseum.org/research/
Buried: Saint Joseph Cemetery, South Bend, St. Joseph Co., IN
I'd look for his death certificate and obit too.
The Polish Genealogical Society, https://pgsa.org/
might be able to help you with research in Poland. Successful Searching!
Died: St. Joseph Co., RR 3 & New Carlisle, Oct. 25, 1931