Hope this gets to you and anyone else who may need this information.
Olivier Vallee was the son of the Francois Vallee (b 1776) that you mentioned and Marguerite Nidding (married on 11/31/1807). Olivier & Euphromene (or Euphrosine) emigrated to Cape Vincent, Jefferson Co., New York approx 1881.
Their children that you have listed: De__ b . 1853 would be Jerry Desiree Vallee/Valley who was born 7/29/1853 (my husband's great grandfather). Trefle b. 1856 would be Frederick Louis Trefflee Vallee who was bon 3/24/1856 and died 1/19/1928 (buried St Vincent dePaul Cemetery, Cape Vincent, Jefferson Co., New York)
Francois Vallee married Rosalie Bouchard on 11/17/1845
Veronique's last name was Consigny and she and Louis were married on 11/8/1842.
Antoine married Flavie on 7/2/1832 in St Martine.
This information was given to me by a Valley aunt from information that was passed down to her from Jerry Vallee/Valley.
Would love to trade other information with other relatives. I know that a Robert Vallee is trying to collect the current generations of the Vallee/Valley family.