John Johnson of LA and his nephew Carl Svarva

Hello All, I am new the forum and am looking for any and all information regarding my gg grandfather and his nephew's antecedents. All we know that is they came from Norway. John Johnson (clearly Johan Johanson) immigrated around 1869. After settling in he sent home for his Nephew C (K) arl Svarva or maybe Svarrva. They both settled in Caddo Parish in LA. Carl became a successful business man in the community but died young in 1918. His widow who was much older than him was left alone to raise their adopted son who in turn died a few years later. There is a life-sized memorial marble statue to the boy in the Forest Park cemetery in Shreveport, LA. John Johnson had 6 children with Ella Green(Carl's wife's sister actually) in Shreveport, La. Their descendents are spread far and wide and I am actually having difficulty tracking down the family members. ugh. I would really like to find living descendents in the USA as well as Norwegian ones not to mention what area of Norway the family originated from. : ) Any and all help would be appreciated. Thanks, Shannon