My family in US..

In January/february 1921 vent Ragna - born Bjørnsrud and her husbond Rangvald Rangvaldsen Bergen, Norway. Rangvald vas born i Lofoten (Nordland) and Ragna near Gjøvik ? In Norway they left ther daughter Lilly behind their family. They went too New York and Broocklyn where they woorkt as Ragna piano thetcher and Rangvald no a boat. Leither they had a rastautante i Brooklyn. In 1924 they got a per of twins, Gerd and Sigrunn (nd ?). In US they got a new name (Peterson ?) Is there anyone who know the family in US or know the history ? Please write me and excuse my bad langune.