I am doing my family tree and have been told that Elna Sederstrom and Peter Eckberg, my great grandfather, were siblings. I would like to know if anyone has information on when and where they came to the USA. There was also another brother Nils Hokanson and sister Hannah Anderson. According to my grandfather they came to the US in 1866. Elna's daughters were Hannah Christpherson, Whilamina Lindgren and Amelia (Peterson) Rehiner. Any information would be helpful.