Norwegian immigrant's names are a thorny problem. Chances are, the name was a patronymic when she was born, and likely ended with -datter. Karen or Caroline (and chances are decent that the name has been Americanized. It could even have been Kari in Norway). Her father's given name was probably Hendrix or Hendrick, but HIS "last" name (and don't call it that, or you'll get in trouble) would have been a name reflecting who he was the son of. Her father might have been named Hendrix Pedersen or Olesen or Nelsen, depending on what HIS father's name was. (I am definitely not an expert.) I think I read that "-sen" or "-ssen" is a typical Norwegian ending meaning "son of". But when they arrived in the US, the ending often changed to something more familiar to Americans --often ending "-son". Sometime when Norwegians traveled far, they used the name of the farm (if there was one) that they came from as a surname.
It's enough to make you run screaming from the room. But here is a tiny bit of help:
An "Alice Termina Grant" died in La Grange Park, Cook, Ill.on 03 Dec 1936, and who was born 02 May 1876, has parents listed as:
Father's Name: Alexander Berntson
Father's Birthplace: Stevenger, Norway
Mother's Name: Caroline Hendrickson
Mother's Birthplace: Stevenger, Norway
Spouse's Name: Oren
Burial Date: 07 Dec 1936
Burial Place: Proviso Township, Cook, Illinois
Here's a link from FamilySearch: https://www.familysearch.org/ark:/61903/1:1:NQ6B-ZLK
Here is her Findagrave memorial page
https://www.findagrave.com/memorial/132458968/alice-grant (It doesn't have a lot of extra help, though).
There were deaths listed for another probable sibling of Charles Berntson -- but Alice's had slightly more information. If I were you, I would try to find census information for Charles and Alice and add everything to Wikitree, sources and all. There was also a brother named Thomas Berntson who died in 1910: https://familysearch.org/ark:/61903/1:1:N7C5-T22 If you track down their families on each available census, you might even find the widowed mother living with one of them in one of the census years.
Wish I could help you more.