I just saw this....12 years later... My 3rd great grandfather was Casper Peter Kjoller. I'm looking at all of the posts and it is mind boggling how much information can be found on this family. I had already updated a lot of my tree with information I had seen previously but I never thought to reach out to family members. My grandmother's maiden name was Koller. Her father was Arthur Frederick Kjoller who changed the surname to Koller. Incidentally, he married a Keller just to confuse everyone. His father was Anders Peter Kjoller whose father was Casper Peter Kjoller. Was your grandfather Frederick Christian or Mogens Sophus?