There is a lot of informations on their descendants posted on rootsweb.com and also on gencircles.com the genealogy posted on this last website - ref. Marie Vanchesteing (d/o Jean-Baptiste Vanchestein & Flavie Bisson) married Nov.26-1860 in St-Michel de Napierville / QC, to Blaise Comette (s/o Blaise Comette & Julienne Monette).
Jean-Baptiste Weissenstein or Vanchestein (s/o Carl Christopher Weissenstein & Angelique Riel).
I even found some informations on the internet concerning the ancestors of Carl Christopher Weissenstein in Germany. I am not sure on which websites, either ancestry.com or may be on rootsweb.com just try the name Weissenstein or Angelique Riel and look where it will bring you.
How are you related to the Weissenstein or Vanchesteing family? So far, I have gathered over 50 pages of informations on the Weissenstein / Vanchesteing family, either at the library or/and on the internet.