Ouensen family from Strai, Oddernes, Norway

Looking for some cousins. I am seeking any information about the family of Ouen Kristensen and Aasne Syvertsen, married Dec 7, 1864 registered at Oddernes, V-Agder, Norway. They had 3 sons Kristen Ouensen born Sept 21, 1865 at Stray, Syvert Ouensen (Stray) born 27 Dec 1870 and Adoph Severin Ouensen (born?). They all moved to America but I don.t have any info. Would appreciate any help to find when and where these families immigrated to. Thanks Suzanne