My records indicate tnat at least 11 children were born to this union-5 in Caladonia, Wisconsin and 6 at Port Washington. The eldest, Veronica Ackermann, married Mathias Wiltzius on 18 April 1888 at St. Mary's in Port Washington. Mathias was the eldest son of Nicholas Wiltzius/Anna Maria Hemmen being born in Muskegon Michigan. His younger brother Michael was my grandfather. Nicholas ran a brick yard in Port Washington. His wife Anna died and Nicholas remarried Maria Thoma in 1865 in Port Washington where he owned a brickyard for many years. Veronica and Mathias never had children of their own but adopted a girl named Jennette who was born in New York on 8 February 1888 and who married Nicholas Tholl of Belgium, Wisconsin. I have much more information and I believe Martin's father was Anton not Johann as sugested by others.