If you google Gudmund Osmundson or Gudmund Osmundsen, there are some online genealogy reports for him.
About 2/3 of the way down on this page, it mentions one of the daughters and her husband.
http://www.rootsweb.ancestry.com/~wgnorway/larson-christo.ht... Just an excerpt:
Caroline Jane (Osmundson) Larson, wife of Lawrence was born in 1863. (The following information was obtained from church records near Nerstrand,
Norway). Her parents immigrated from Nerstrand, Norway. Her father's name was Gudmund Osmundsen. He was born March 20, 1822, the oldest of three children. Her father had a sister Maren Osmundsen born February 24, 1824, and a brother Osmund Osmundsen born March 31, 1826. Gudmund's father's name was Osmund Osmundsen and his mother's name was Astri Gunmundsdatter Osmundsen.
Caroline's father immigrated to Grant County near Hoffman, Minnesota and
homesteaded on Elk Lake. His brother Osmund settled in Southern Minnesota
near Nerstrand. Osmund was one of the founders of St. Olaf College. (He also
took part in the California gold rush) His sister Maren may have settled in
Wisconsin.
Caroline possibly must have been about 21 years of age when she and Lawrence
wed. She was living on a farm on Elk Lake and they may have met through
relatives. Lawrence was approximately 27 years old when they married.
Submitted by Carolyn Jane Larson (great great grandaughter)
1875 census in Grant county:
https://familysearch.org/pal:/MM9.1.1/MKN6-B25Name: Gudmund O Osmundsen
Residence: 2nd Census District, Grant, Minnesota
Age: 54
Estimated Birth Year: 1821
Father's Birthplace: Norway
Mother's Birthplace: Norway
Birthplace: Norway
Race: White
Gender: Male
Line Number: 19
Family Number: 26
Film Number: 0565720
Household Gender Age
Gudmund O Osmundsen M
Ellia Osmundsen F
Osmundsen Osmundsen M
Syvert Osmundsen M
Edward Osmundsen M
Caroline Osmundsen F
explanation of the place Nerstrand, in Rogaland county, Norway.
http://en.wikipedia.org/wiki/NedstrandThe baptism in Norway of Gudmund Osmundson
https://familysearch.org/pal:/MM9.1.1/N4BD-2X2parents: Osmund Osmundsen, Astir Gudmundsdr
name: Gudmund Osmundsen
gender: Male
baptism/christening date: 31 Mar 1822
baptism/christening place: NEDSTRAND, ROGALAND, NORWAY
birth date: 20 Mar 1822
father's name: Osmund Osmundsen
mother's name: Astir Gudmundsdr
indexing project (batch) number: C42881-2
system origin: Norway-VR
source film number: 126243
https://familysearch.org/pal:/MM9.1.1/N4BD-2X2