I could not get your link to work. I'm looking for information on the family of Frederick "Otto" Exner, b. @ 1850 at Forst, Lausitz, Brandenburg, Germany. He had one known sister, Maria Magdalena b. 1856 married twice, Ernst Najork and ? Roth. Another sister married a Schramm. Otto married Berta Emilie Muller abt 1877. Their children were Martha, Anna, Richard, Flora, Otto, Frederick and Helene "Elsa".