Telemark lost-at-sea mystery

Good afternoon! A family connection (details below) came to the US with the story that the father of the family and the eldest son were lost off the coast of Kragero Telemark. As the story goes, the wife watched them set out in a boat and witnessed the sinking. The widow then emigrated with her young children to Wisconsin (Shawano County) where they settled permanently. So far no one has found concrete information to support the Kragero story. Also, there are conflicting dates for the deaths and also for the arrival of the family in the US. The details known are as follows: Inger Claudine Halvorsen (mother) b 21 Nov 1854, c 10 Dec 1854 in Brevik. d 20 Jan 1939 Hutchins, Shawano, WI Jens Larsen (father) b? 11 Aug 1845 Bamble, d? 12 Feb 1892 at sea (date debatable) Children: Lars Laurentius Larsen b 24 May 1875 Bamble, d? 12 Feb 1892 at sea (date debatable) Oliver Larsen 4 July 1877 Bamble, d 4 January 1958 Hutchins, Shawano, Wisconsin Annie Larsen b Feb 1880 in Norway (birthplace unknown) Peter Larsen b Apr 1885 in Norway (birthplace unknown) Olga Larsen b Sep 1889 in Norway (birthplace unknown) Hans Carl Larsen b 31 Jul 1891 Oslo, d 27 Feb 1982 Mattoon, Shawano, Wisconsin Information about Annie, Peter and Olga is sparse; no death records for Lars and his father. There is also a story that Hans Carl Larsen was a posthumous baby which means that the death dates for father and son listed above would be incorrect. Various emigration dates also have them arriving in the US from 1891 to 1892 (I need to follow up more closely on this.) I do have Inger Claudine Halvorsen's digitalarkivet christening information as the Halvorsen family was close to my g-g grandparents who were witnesses for this event; she was also a friend of my g-grandmother (they were the same age) who emigrated 10 years before her to Shawano County and this may or may not have influenced where she came with her family as they settled within a few miles of each other. There just may not be concrete or verifiable information out there, but sometimes when I look at records too long I miss the obvious, so perhaps a new set of eyes may notice something new. Thanks in advance to anyone who can shed even a glimmer of light on this story. I also have another Telemark lost-at-sea mystery but that is for another posting! Kathy