I am looking for more info on the following family. Daughter Charlotte m. a Knickmeyer. I believe they are ancestors of my husband's Knickmeyer line.
Any other clues appreciated!

1-Friedrick Wilhelm BISMARCK Major
b: 1787 in Calau, Germany
sp: Sophie Charlotte GRAEBEL
b: in Calau, Germany
. . . . 2-Charlotte Wilhelmine Amalie BISMARCK
b: 20 Nov 1803 in Potsdam Stadt, Brandenburg, Preussen
. . . . 2-Louise Albertine Bismarck
b: 25 Feb 1806 in Potsdam Stadt, Brandenburg, Preussen
. . . . 2-Sophie Ludewike Bismarck

Regards,
Christina