My father's father is from Slavonia and listed his nationality as Croatian. My great grandfather is German, my great grandmother is Hungarian.
My one American grandparent is mostly German as her maternal grandparents were from Germany. LOL the grandparent I know the least about is the American one!
Hubby is a Cajun boy. The Cajuns are actually made up of French, Spanish, German, Italian, Austrian and Swiss. Hubby's family mostly traces to French and some German. I am a genealogist and love tracing our family.