Descendants of Nels Olsen, Fort Dodge, Iowa

We would like help in finding possible descendants of Nels Olsen (1875-1929). Nels was born Nils Olsen Hanakam at Sand, Rogaland Province, Norway, in 1875. His mother was Brønla Andersdotter Helland (1853-1923), and his father was Ole Nilssen Hanakam (1849-76), both of Sand. Ole died shortly after Nils was born, and he and his mother emigrated in 1882, settling in Fort Dodge, Webster County, Iowa. Subsequently, Brønla remarried Osmund J. Aabø from Sauda, Rogaland, Norway, and they had 5 children: John, Ranveg Elizabeth, Anna, Elmer and Selmer. We are fairly certain that Nels was buried in St. Olaf's Cemetery in Douglas Twp. This information is on the Web at http://www.rootsweb.com/~iawebste/stolafscemetery.html under his name. His parents are also listed on that site: Osmund and "Brymla" Johnson. Thanks for any information!