My wife has researched my side of the family a bit. She knows the details but this is the little bits that I know...
On my Dad's side my grandfather was the son of Norwegian immigrants. I believe his mother was from a family of
Banat Swabians who had moved en masse to North Dakota during some of the pre War War I ethnic cleansing by the Magyar. I know my wife has traced both sides back a bit further but I don't know how far or to whom.
On my mother's side she was the daughter of german jew and a german. What has survived from the holocaust is a few papers indicating both families were fairly wealthy and that my grandmother was a physician (pretty rare for a woman in pre WWII Europe.) Again, I know my wife has taken the lineage further back, but it's not really an interest of mine so I don't know how far.