Christian and Celia Anderson

Dear cousin Leta found my grandma's parents and grandparents! Leonard "Len" (Jen?) Welch married Martha Anderson (there's that name again, any links to the Andersons here?) Christian and Celia Anderson were Martha's parents (or were their names Kristian and Sille?). Does anyone have any record of when they came to the USA? We are having a tough time trying to locate these folks, my great, great grandparents. I know I, as well as Leta, would love to find out this information. Anyone, please??? :D