Another son of Jean Baptiste Daoust and Julie Cotuan who relocated to Alpena, Michigan with his wife and family is Alexis "Alexander/Alex" Daoust. Alex married Obeline or Adeline Seline Mainville (d/o Joseph Napoleon "Paul" Mainville and Henriette Benoit) 1/16/1866 in Ste-Cecile.
Descendants are still diligently trying to locate a birth family for Jean Baptiste, who appears in his marriage record to Julie simply as "Jean Baptiste" (no surname is given). We cannot locate a birth record for him in the PRDH as Jean Baptiste Daoust, either.
Any information that you may have on Jean Baptiste would be especially helpful.