Can't answer your question, but you and I are related. I have done a fair amount of genealogy research and the Grunkemeyer's in Nebraska are an isolated family. My Grandfather, Morris Grunkemeier was born in Burwell. He is the son of August Grunkemeyer who lived there with family after moving from Germany at a young age with parents and other siblings. Do you have any details of the family line? Stories? Perhaps were could swap?