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Constant Garceau was the son of Alfred Ovilla Garceau (1821-1892) and Rosemarie Montmigny. His siblings were Jeremie Garceau (1842-?), Brigitte Garceau (1845-?), Narcisse Garceau (1849-?), Alfred Joseph Garceau (1853-1945), Marie Delima Garceau (1865-1865), Francois Jules Garceau, Marie Garceau, Euphemie Garceau, Philomene Garceau.
Constant Garceau's wife was Henrilie Daigneault. They were married 3 NOV 1868 in Lacolle, PQ. They had 7 known children named Marcellin Garceau, Joseph Anasthase Garceau (1880-?), Napoleon Garceau, Edouard Garceau, Salomon Garceau, Marie F Garceau, and Wilbrod Emile Garceau.