Hallo agein Richard.
I have done some digging in the churchbooks from Västerås county, and I found that Otto Olsson (Olofsson) works as a farmer-hand on diffrents farms in the area. In 1880 the 13th of Mars he emigrated to USA.
I was not able to find enything about Ottos sister Karoline.
I think you have all your family in USA.
Tore Bakken Sweden.