Nelson family from Haugesund

I'm looking for information on my grandmother's family. Maria Nelson (Nielsen) immigrated from Norway in 1904 at age 16. Her parents were Nels Nelson and Kaea (?) Helena Bjork Nelson. Siblings included brothers Louis Nelson, Karl Nelson, Nels Nelson (immigrated to Brooklyn, NY late 1890s, early 1900s - drowned in Sheepshead Bay, NY), and sisters Nellie (married to John Thompson - they had one son John Jr - father and son drowned in Sheepshead Bay, Ny), and Josephine (her identical twin, married name Snieg). Maria (or Marie as she was known) married Joseph Toterhi in Yonkers NY between 1910 and 1920. They had three children, Mary, Thomas and Helen. Any info would be appreciated.