Hi Craig
You may have found them by now. This Olof has the same birth date as your Olof 28 Oct 1838.
1880:
Magnusson, Olof b.1838 - Father
Andersdotter, Anna Sofia b.1843 - Mother
Karl Julius b. 18 Dec 1864 in Nor
Sofia Charlotta b.1866
Matilda b.1871
Johan Fredrik b.1874
Hanna Maria b.1876
Karl went to USA Nov 1884
Sofia went to USA May 1882
The mother died in 1881 and the rest of the family also moved to USA in May 1886.
Ian