Gratien Oliver Blanchard
- Born: Dec 18, 1819, Plattenville, Assumption, Louisiana, United States
- Christened: May 11, 1820, Plattenville, Assumption, Louisiana, United States
- Marriage (1): Theotiste Anaise Leblanc on Apr 25, 1842 in Paincourtville, Assumption, Louisiana, USA
 FamilySearch ID: 9K83-VGX.
Gratien married Theotiste Anaise Leblanc on Apr 25, 1842 in Paincourtville, Assumption, Louisiana, USA. (Theotiste Anaise Leblanc was born on Apr 21, 1825 in Donaldsonville, Ascension, Louisiana, United States, christened on Sep 11, 1825 in Donaldsonville, Ascension, Louisiana, United States and died on Apr 5, 1922.)
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