I'm sorry about the delay in this reply. Yes I do belive that the Carl Tetzlaff you mention is my Great Grandfather. With the exception of a date discrepancy, everything else seems to match up. I am doing some of this research on behalf of my father, and his cousin, who are interested in their genealogy. I think I can probably provide you with some more info on Carls children, and other descendants. I would also be interested in obtaining some additional info on your research.