Pierre De La Fosse's baptism record from 9 August 1816 states he was born about 2 April 1813 to Pierre De La Fosse and Claire "Wayble" and his maternal grandparents being Joseph Wayble from Maryland and Mary Teyssin, a native to the area. However, his father's marriage record and his succession record give his wife's maiden name as Lavigne. To see the variations in maiden names used for his mother, please see his father's profile. I don't know if this is the case here, but I've seen such confusion and discrepancies occur when the grandmother has remarried.
All from Southwest Louisiana Records CD by Rev. Donald J. Hebert, 2001
DELAFOSSE, Romain (Romain & Marie Antoinette SAVANT) b. 11 July 1839 (Opel. Ch.: v. 4, p. 127)
DE DELAFOSSE, Marie Louise (Romain & Marie Antoinette SAVANT) b. 13 March 1841 (Opel. Ch.: v.4, p. 179)
DE DELAFOSSE, Eugenie (Romain & Marie Antoinette Pierre SAVANT) b. 24 Dec. 1843 (Opel. Ch.: v.4, p.226)
DE DELAFOSSE, Ermantine (Romain & Marie Antoinette SAVANT) b. 20 Nov. 1845 (Opel. Ch.: v.4, p.275)
DELAFOSSE, Marie Clementine (Romein & Marie Antoinette Pierre SAVANT) b. 8 July 1849 (Opel. Ch.: v. 4, p. 373)
↑ Southwest Louisiana Records (1750-1900) CD by Rev. Donald J. Hebert, 2001
DELAFOSSE, Romain (Romain & Claire WAYBLE - of this parish) b. about 2 July 1813, bt. 9 Aug. 1816 Pats: Romain DELAFOSSE - from France & Rozalie BENOIT; Mats: John WAYBLE - from Maryland & Mary TEYSSIN - from here; Spons: Alexandre ROUGEAU & Marie Anne SOILEAU, his wife. Fr. Michel Bernard BARRIERE (Opel. Ch.: v.2, p.84)
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCJD-JN3 : accessed 10 January 2016), Roman De La Fosse, St. Landry parish, St. Landry, Louisiana, United States; citing family 2135, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Southwest Louisiana Records CD by Rev. Donald J. Hebert, 2001. Text:
DELAFOSSE, Romain m. 6 May 1837 Antoinette SAVANT (Opel. Ct. Hse.: Mar. #43)
DELAFOSSE, Romain 23 yrs. old (Romain & Clarisse WYBLE) m. 23 May 1837 Marie Antoinette SAVANT, 23 yrs. old (Opel. Ch.: v. 2, p. 115)
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It may be possible to confirm family relationships with Romain by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Romain: