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Thomas Garceau is the son of Alfred Joseph Garceau (1853-1945) and Virginia Jane Gamelin (1859-1943). His siblings were Marie Josephine Garceau (1881-?), Alfred Joseph Garceau (1884-1958), Joseph Absolam Garceau (1888-?), Marie Albina Garceau (1892-1963), Rosella Garceau (1893-?), Lador Garceau (1898-1969), Emile Joseph Garceau (1899-1971), Florence Garceau (1903-?), Celanire Garceau.