tkar on Family Tree Circles

I am searching for family of my great grandmothers sister who emigrated to the United States 1881. I have received some info regarding the family, but now i struggle to get ahead in my search.
Her name was Catherine Danielson born 11 sept 1853 in Norway.(her name in norway was carine andreasdatter).Her husbands name was Willian Danielson born april 29, 1849 in Sweden.They had 6 children 2 born in Norway and 4 born in USA. Childrens name was Charles L Born in Aug 1877, Minnie C born May 1880 in Norway. Fred E born in California in dec 1883, Georg L born in California may 1888, Walter born in California in nov 1890 and Agnes C born in California april 12 1895.
I have information that Agnes C married a Walter Mortensen nov 8 1914. They have 3 children, Marian L born 31 oct 1915, Roberta born jan 7 1921 and Walter ross born jan 22 1928.

Hope someone can help me in this search.
thanks from tkar.