This name is a lot of fun and has been spelled a variety of ways, especially since the German character of the “double s” looks like an “f” or a “p.”  To begin, Mathias Assmann married Elizabeth Schneider, and they had 7 children.  It appears she died in childbirth in the early 1830’s.  Mathias married another Elizabeth, and they immigrated with the children to the United States.  Mathias and his 2nd Elizabeth did not have children together.  Daughter Anna Maria married Christopher Kessler in Detroit, Michigan in 1847.  (I intend to add more information here with documents, etc.)