Lars Watne was born 19 Jul 1872, and baptized Lars Johan Villumsen in Høyland, Rogaland, Norway, on 1 Sep 1872.
As Villumsen is also his father Jonas Villumsen’s patronymic last name, his last name is a frozen patronymic name (a former patronymic name adopted as the last name). In the 1875 Norway Census, Lars is instead listed as Lars Johan Jonassen, using the patronymic last name. Upon arriving in the United States, he adopts Watne as his family name, based on his Norwegian farm name Vatne (rural residence Foss-Vatne).
Lars’ wife Sophia Helgeson was born 16 Jul 1877, and baptized 5 Aug 1877 in Birkrem parish, Helleland, Rogaland, Norway.
Sophia’s baptism record only lists her given name Sofie, with no last name listed. At the time of her birth, her family lived at the rural residence Tjørn, so her name at birth was likely Sofie Tønnesdatter Tjørn. In the United States, she adopts Helgesen as her family name, using her father Tønnes Helgesen Tjørn’s patronymic last name. She also went by the nickname Sophie.
She is listed in the 1891 Norway Census as Sofie Tønnesdatter Kjørren, using the patronymic last name Tønnesdatter and the farm name Kjørren.
The photographer George Von Blon, established the Von Blon Studio in Cooperstown in 1900. “… Von Blon is known to have practiced his trade upstairs in the two-story frame building on the east side of 9th Street, one-half block south of Burrell Avenue. The building is now  known as the Lende building.” 
Perhaps a family member knows if this is a wedding portrait, which would date it about Dec 1904.
The portrait’s verso notation, handwritten, is:
Mr and Mrs. Lars Watne
Lars Johan Villumsen (1872-1948) is 2nd great-grandfather of MKS in the Watne branch.
Sofie Tønnesdatter Tjørn (1877-1963) is 2nd great-grandmother of MKS in the Watne branch.
Photographer: George Von Blon, Cooperstown, North Dakota.
 Cooperstown, North Dakota 1882-1982 Centennial, 181.