Looking for information on the following families in St. Mary Parish, LA

Justine Emelie Knobloch born 12/19/1838 (parents Felix Adolph Knobloch and Marie Heloise Gros)La Fourche Parish married on 11/9/1854 in Thibodeaux Miles Taylor Bernard born 1835
one of the children: Justine Lorina Bernard born 9/4/1862 La Fourche Parish married on 10/4/1883 in St. Joseph's New Orleans Sylvain August Badeaux born 6/6/1858 La Fourche

one of the children: Anna Mary Ester Badeaux born 11/8/1895 Franklin, St. Mary Parish married on 2/26/1919 at St Mary's Port Arthur, TX Murphy Michael McNulty born 4/20/1895 Franklin, LA. Murphy's parents were Mike or Michael McNulty and Rosena Bernard.

It is believed that Rosena (?) Bernard and Justine Lorina (Knobloch) Bernard were cousins either by blood or marriage.

Any information would be greatly appreciated.