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Joseph Le Blanc is on the Wall of Names at the Acadian Memorial in St. Martinville, Louisiana Plaque 5 Left. Listed with him is his spouse Isabelle Gaudet and four children: Anne Joseph, Isabelle and Gilles. 
[There is a slight difference in dates reported by Stephen A.White from the parish register at Grand Pre. He cites a birth date of 24 Feb 1720 and a baptismal date of 25 Feb 1720, with sponsors as shown below (Jean Gautrot and Marie LeBlanc). The marriage to his third cousin by dispensation of consanguinity (4th degree) is as shown below. White reports Joseph's ages in the various St. James' censuses as follows: 1766 (48), 1769 (50, 1777 (57). Burial data in White is the same as below.]
Joseph Leblanc, (Jacques Leblanc and Catherine LANDRY) bn. 23 March 1720, bt 24 March 1720 spo. Jean Gautreau and Marie Leblanc (SGA-2, 18)
Joseph LEBLANC (Jacques Leblanc, of the parish of St. Charles of Grand Pre, Mines and Catherine LANDRY) m. 2 Jul 1742, Isabelle GODET (Bernard Godet & Jeanne TERIOT) witnesses: Jacques LeBLanc; Simon LeBlanc; Jean Baptiste LeBlanc; Bernard Godet; Alexandre Prejean. Priest: Fr. Defenetaves.
Arrived LA 1765, age 45;
On Cabanocé census, 1766, right [west] bank, JUDICE's Company, Cabanocé Militia, called Joseph LEBLANC, father, age 48[sic], with wife Isabelle age 47, sons Josephe age 16, Gilles age 9, daughters Anne age 18, & Isabelle age 13, 0 slaves, 6 arpents between son-in-law Athanase BREAUX & son Joseph, fils, 5 cattle, 0 sheep, 8 hogs, 2 guns;
On Cabanocé census, 1769, occupying lot number 23, right [west] bank, age 50, with wife Isabelle age 50, son Gille age 11, daughters Anne age 20, & Isabelle age 14;
On St.-Jacques census, 1777, right [west] bank, age 57, with wife Elizabeth [Isabelle] age 57, sons Gilles age 17, & Grégoire age 15;
On St.-Jacques census, 1779, with 3 unnamed whites, 4 slaves, 10 qts. rice, 50 qts. corn;
LEBLANC, Joseph, age 86 yrs., widower of Isabelle GODE, bur. 12 July 1805 (SJA-4, 26) 
↑ Title: The Wall of Names at the Acadian Memorial; Author: Wall of Names Committee; Jane G. Bulliard, Chair; second edition, 2015; Bodemuller The Printer, USA; Personal Copy. p. 21
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It may be possible to confirm family relationships with Joseph by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line:
Leblanc-1770 and LeBlanc-1688 appear to represent the same person because: Same name, linked to the same spouse, daughter Elisabeth on LeBlanc-1688 is a daughter of the parents on Leblanc-1770. LeBlanc is preferred surname spelling for the Acadian Project.