My Great Grandfather was a Sivert Koski who grew up and lived in the Keweenaw County Area in the U.P. of M.I. I know he had a relative that was named Henry Koski. Off the top of my head I do not know if he was his father, a brother, uncle or cousin. But, I do know that when I was just up there taking my Son to visit his Great Great Grandmother "she is still alive wow!" we stayed at her house and while I was there found boxes "pretty big boxes" of a lot of old old pictures of Koskis in that area. I know that one was named Henry I even went to his grave and took a picture of that. I should call my grandmother and ask her what relation he had to my Great Grandfather. So I will update this post ASAP.