Sorry but I just found your message regarding Silvanie/Silvania Derosier. What I have according to the 1900 United States Federal Census list for the state of Louisiana in the county of Vernon
John Cryer born Nov. 1832 wife Silvana born July 1842 in Louisiana her father and mother born in Louisiana daughter Laura B. born July 1877 in Louisiana daughter Silvana J. born Nov 1883 in Louisiana
The information is very close. I had at one time a letter stating that the Derosier's had came from Nice, France to Louisiana. But I no longer have that? Any information you could add would be very helpful.