Although this is not the answer to Query, here is a possible clue. In FRENCH FAMILIES OF THE DETROIT RIVER REGION on page 1172 there is a Medard THOMAS [s/o John Baptiste2, Jacob1], b 24 Feb 1809, and Mary Ann GREFFARD who have 3 recorded children. John Baptiste b 1830, Thomas b 30 Aug 1842, and John b 31 Aug L'Anse Creuse, bp 20 Dec 1846 Mt Clemens. Medard THOMAS had an uncle named Robert THOMAS. Good luck, Lorelei Maison Rockwell