Pierre 'the younger' Gaudet and Pierre 'the elder' Gaudet are both listed on the 1671 Census. They were brothers and both married women named Blanchard. Each had a son named Jean or Jean Baptiste. Anne born about 1645 married the elder Pierre and Marie born about 1656, married the younger Pierre.
There is confusion about which Pierre Gaudet died in 1741. There is a record which states a Pierre Gaudet died on 8 Dec. 1741, age 89 which would give a birth year of about 1652, consistent with the older brother, however their birth dates are only about 2 years apart and age at death in a record is very unreliable. Both brothers had the same death date.
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Alternate Spelling: Gaudette
Pierre Gaudet the elder was born around 1652. He is listed in the 1671 census of Port-Royal at age 22, living with his parents and four siblings. Pierre was married about 1672 to Anne Blanchard, daughter of Jean Blanchard and Radegonde Lambert, and widow of François Guérin. The family is enumerated in the 1678 census of Port-Royal with three sons.
Pierre and Anne settled on land west of his younger brother, Pierre le Jeune. In the census of the Port Royal river valley for the year 1686, Pierre Godet l'Aîné was 35 years old, his wife Anne Blanchard was 41 years old, their children were: Gérard (stepson), aged 20 years; Bernard, aged 13; Pierre, aged 11; Claude, aged 9; Abraham, aged 7; Marie, aged 4; Madeleine, aged 4; and Jeanne, aged 2. Pierre l'Ainé had 4 arpents of cultivated land. In the 1693 census of the Port Royal river valley, Pierre Godet l'Aîné gives his age as 41 years old, his wife Anne Blanchard was 48 years old; their children were: Bernard, aged 19 years; Pierre, aged 17 years; Claude, aged 15; Abraham, 13; Magdeleine and Marie (twins), 11; Jeanne, 9; Augustin, 7; and Jean, aged 3 years. Pierre l'Aîné had 26 arpents of cultivated land, 10 cattle, 12 sheep, 10 pigs, and 3 shot guns.  Pierre l'Ainé left the Port Royal river valley in 1696, leaving his farm to his eldest son, Bernard "le Vieux" (the old), who married Jeanne Terriot. In 1698, the farm had an orchard of 50 trees. Bernard became the chief of the branch of Gaudets who perpetuated in this place at the same time with the descendants of his uncle Pierre Gaudet dit le Jeune, his neighbor.
Pierre l'Ainé settled at Beaubassin, where he expanded the most vast marshland on the east coast of North America. He built his home on the hill beside the Tintamarre (today Tantramar) river. Along with Pierre Thibodeau, who founded the nearby Chepoudy settlement, Pierre l'aîné defied the claim of the seigneur of Chignecto, Michel Le Neuf de la Valliere et de Beaubassin, that the Chepoudy and Petitcoudiac settlements were part of his seigneury. Gaudet and Thibodeau won their case before the colonial council at Port-Royal. Their defiance of a powerful Acadian seigneur helped weaken the hold of the local nobility on these sturdy Acadian habitants.
The family returned to Port-Royal some time between 1700 and 1703 because they are listed in the census of 1703 of Port-Royal. 
At a Council held at the Honble. Lieut. Governor's house in His Majesty's garrison of Annapolis Royal upon Wednesday the 4th May 1720.
His Excellency the General, the Honble. Lieut. Governor Major Lawrence Armstrong, Major Paul Mascarene, The Revd. John Harrison, Esq., Cyprian Southack, Esq., Arthur Savage, Esq., Hibbert Newton, Esq., William Skene, Esq., William Shirreff, Esq.
The six French representatives (who appeared according to order) of the inhabitants of this river, being sent for in before the Council, were demanded to shew their power from said inhabitants who delivered in their power in writing which was read.
Their qualifications as freeholders were examined vizt. Prudent Robichaux, Alexander Robichaux, Nicolas Gautier, Barnard Gaudet, Charles Landre, and Pierre Gaudet. Nicolas Gautier not proving that he was a freeholder of this Province only a transient person was excepted against, likewise Prudent Robichaux having but a slender propriety in the said Province was also excepted against.
Advised and agreed,
That another order in writing be sent to the French inhabitants of this river from His Excellency the General to choose two other persons in the room of said Prudent Robichaux and Nicolas Gautier to serve as representatives of the inhabitants of this river with Alexander Robichaux, Barnard Gaudet, Charles Landre, and Pierre Gaudet. That Major Paul Mascarene draw up said order for his Excellency's perusal and signing."
Stephen White gives the same date of death for both brothers. In the document "37 families" it is written that Pierre L'Aîné died on 8 December 1741 whereas in the Dictionnaire, this is Pierre Le Jeune's date of death but he remains silent concerning L'Aîné. It is presumed that he died after the 1714 census of Beaubassin since he does not appear in any record after that.
Pierre Gaudet l'aîné, né vers 1652, prit pour femme, vers 1672, Anne Blanchard, fille de Jean Blanchard et de Radegonde Lambert, et veuve de François Guérin. Il demeurait à Port-Royal, où il est décédé soit le 8 décembre 1741 ou après le recensement de 1714. "
Denis GAUDET, 46, wife, Martine GAUTHIER 62; Children (the first 2 married): Anne 25, Marie 21, Pierre 20, Pierre 17, Marie 14; cattle 9, sheep 13.
↑ 2.02.12.2 Stephen A. White, "La généalogie des trente-sept familles hôtesses des 'Retrouvailles ‘94'" in Les Cahiers de la Société historique acadienne, vol. 25, nos 2 et 3 (1994) GAUDET, p. 1, 37 Families
↑ Nova Scotia Archives ...: Selections from the public documents of the province of Nova Scotia. Pub. under a resolution of the House of Assembly passed March 15, 1865. Ed. by T.B. Akins. The translations from the French by B. Curren. 1869
Volume 1 de Nova Scotia Archives, Nova Scotia. Commissioner of Public Records. Collaborateurs Thomas Beamish Akins, Nova Scotia. Commissioner of Public Records Éditeur C. Annand, 1869
Original provenant de la New York Public Library. p. 24-25 Google Books
It may be possible to confirm family relationships with Pierre by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: