I replied to your inquiry before I saw someone else had given you that info. But then I saw another message about your family settling in Clarkfield Mn. in 1866-70.
I found out that my grandfather, Jacob Storebo worked in Clarkfield, MN probably when he came to USA. I just came upon a photo of him taken in Clarkfield when he was quite young. I know he came over in 1890 and that would make him 18 or so. I wonder if this is the first place he came to and if he somehow knew your relatives from Norway and that is why he came there to work for them. My grandfather later settled in the Finley, ND area where my mother grew up.
I wonder if you have ever heard about a Jacob Gjertsen Storebo who lived in the same place in Norway as your great grandmother. It is fun to find clues about where he came to and why.
Thanks for any info you have. I really think our ancestors where friends from the old country!