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Marcellin Garceau was the son of Constant Garceau and Henrilie Daigneault. His siblings were Joseph Anasthase Garceau (1880-?), Napoleon Garceau, Edouard Garceau, Salomon Garceau, Marie F Garceau, Wilbrod Emile Garceau.
Marcellin Garceau's wife was Julie Duquette. They were married 15 AUG 1892 in Lacolle, PQ. They had three known children named Joseph Anasthase Garceau, Marie Cordelia Garceau, and Delia Garceau.