Johannes JOHANSEN HOLT a.k.a. John HOLT (WI)

I am trying to find some information about Norwegian immigrants Johannes JOHANSEN HOLT a.k.a. John J. HOLT (02 Jan 1850 - 1944) & his wife, Martine HANSDATTER BARSTAD (08 Apr 1850 - 1928) and their descendants. An article on this family can be found here: http://www.wisconsinhistory.org/wmh/pdf/winter_03_zeidel.pdf HOLT's parents were Johannes JOHANSEN HOLT and Sedsel OLSDATTER from Grue, Hedmark, Norway, who emigrated to New Zealand. Martine's parents were Simon HANSEN BARSTAD and Tori (surname unknown) from Barstad farm, Sokndalen, Rogaland, Norway. According to the article, HOLT had 4 children: 2 sons and 2 daughters. All appear to have been born between 1875-1881 (approx). The daughters' names were Junette ("Nettie") HOLT and Thomasine, but I have no information on his sons. Nettie was b. 22 Jun 1877 and married (1) Mikkel Andreas (Andrew) BARTILSEN, and (2) Hans Gabriel STALSON. I would like information on John and Martine's children, children's spouses, and grandchildren. Names, dates and places of birth/death. Thank you.