Marie Heloise Lavergne, daughter of Celestin Lavergne and Louise Henry was born in 1805. She married Viellant Chachere on December 9, 1822 in St. Landry, Louisiana. 
They had at least 9 children. Marie died in 1879. 
Rev. Donald J. Hebert, Southwest Louisiana Records 1740-1900 ("SWLR"), CD #101 (Baton Rouge, LA: Claitor's Publications Division, 2001)
CHACHERE, Felix Veilland - from Opelousas (Louis CHACHEREZ - native of Paris & Catherine VAUCHEREZ) m. 23 Dec. 1822 Alouise LAVERGNE (Celestin - native of New Orleans & Louise HARRY - native of Paris) Wits: L. CHACHERE, Ursin LA-VERGNE, D. DESSESSART, Jacque BACON. Fr. Francois CELLINI (GC Ch.: v.1, p.25, #61)
Find A Grave, database and images (https://www.findagrave.com : accessed 15 January 2020), memorial page for Heloise Lavergne Chachere (24 Feb 1805–23 Apr 1879), Find A Grave Memorial no. 81278983, citing Saint Landry Church Cemetery, Opelousas, St. Landry Parish, Louisiana, USA ; Maintained by Wallace Smith (contributor 47589203) .
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It may be possible to confirm family relationships with Marie by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Marie: