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Gregoire Garceau is the son of Jean dit Tranchemontagne Garceau (1678-1710) and Jeanne Levron dit Nantais (1679-?). His siblings were Pierre Jean Garceau (1704-?), Daniel Garceau (1707-1772), Joseph Garceau (1710-?).
Gregoire Garceau's wife is Unknown. They had one known child named Gregoire Garceau (1745-?).