Yes, I found the family on the 1865 census. As far as I know Olaus and Lisa Nyseth were the only siblings who came to the US. The brother Hans is not the Hans Nyberg in my original post, but from a different family. The son of the brother Andreas is actually the one who is related to my family. This family is only related by marriage, but I was still hoping to find some living relatives of the Nyseth family that came to MN. Thanks for your response.