Jenny, I am also interested in Johan Zweig.My grandfather first married Henriette Martin, who was descended from Michel Labranche, son of Jean Labrance/Zweig.Have you seen the book, Old Families of Louisiana, pages 247-252, which is found on google books, much of which is digitized. I guess you have seen the plantation on the old river road where they lived. Have you learned more about the Zweigs since this was posted?The book spells Catherine's name as "Corius". and they were married in Bamberg, Bavaria. His brother's wife Anna Kuhn, daughter of Simon Kuhn was from Weissenberg, Ausbach, Bavaria.