1David J. Sautter, Immigrants from Wuerttemberg, Germany to Franklin County, Massachusetts, Pub. ca. 2006. Only copy in Greenfield, Ma library.
According to David J. Sautter's extensive research, Mary Hilzinger obviously had 3 illegitimate children in Germany. These children are Christian, Ursula and Anna Maria Hilzinger.
When Christian got married to Barbara Weischadel he changed his name to Adler (see Susan Tetreault Adams's website at http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=connectlinks&id=I1905 ).
When Ursula got married to Jacob Markle she was listed as the daughter of Ferdinand and Mary Hilzinger.
Consequently I have decided to list the father of Christian as Mr. Adler and the father of Ursula as Ferdinand with no surname.