Daphne, I have information about Arthur de Cernea, born Philadelphia 1806, parents French, parents made trip back to France and lost at sea in about 1815, Arthur de Cernea had stayed behind in Pennsylvania, adopted by a local farmer and family, grew up to be a famous physician with a famous architect son, Thomas Lester Cernea. If you're interested, email me at firstname.lastname@example.org
or write me at 2119 West Washington Street, Allentown, PA 18104-4036. Funny how similar the story of your family is to this Cernea. Barbara Miller.