The correct spelling is Faustina. I would suggest to you that a trip to the St. James Parish Courthouse in Convent may prove valuable. To find marriage info on people in the early 1900s that is your best bet, unless you locate a family member who has direct information or has done the family genealogy already. If you can not locate Bertaut info in the St. James Courthouse, I would recommend checking the Ascension Parish Courthouse in Donaldsonville which is actually the closest of the 2 courthouses to Faustina Plantation, being that Donaldsonville & Faustina are both on the westbank & Convent on the eastbank and further down river. Also, if these Bertauts' spouses were from elsewhere, say New Orleans, it is possible marriage information would have to be attained elsewhere.