Hi.I hope you'll give me another chance!St-Lambert is in the county of Chambly, so, first I tried looking in Longueuil (co-cathédrale St-Antoine-de-Pade), Chambly, which is the closest parish to St-Lambert, but there were no good leads.However, another search led to this baptism:
Thomas Elphege Lambert, b. 21 Feb 1839 Chambly (St-Joseph), Quebec, son of Jean-Baptiste Lambert & Julie Vendandigne dit Gadbois.
Here is the marriage for these parents:
Jean-Baptiste Lambert (Pierre Lambert & Monique Graveline) m. 6 Feb 1827 Beloeil (St-Mathieu) Julie Gadbois (Prudent Gadbois dit Vandredage & Marguerite Paquet)
Julie died and Jean-Baptiste remarried:
Jean-Baptiste Lambert (widower of Julie Vandendrigue dit Gadbois) m. 156 Jul 1845 Chambly (St-Joseph) Theotiste Guertin (Louis Gertin & Louise Beaufreres)
Here is this Thomas in 1851:
1851 Census of Canada East, Canada West, New Brunswick, and Nova Scotia about Thomas Lambert Name: Thomas Lambert Gender: Male Age: 12 Estimated Birth Year: abt 1840 Birthplace: Canada Born of Canadian Parents: Yes Province: Canada East (Quebec) District: Chambly County District Number: 5 Sub-District: St Joseph de Chambly Sub-District Number: 57 Household Members: Name Age Jean-Baptiste Lambert49b. 1803; farmer Theotiste Guertin32b. 1820 Nazaire Lambert21b. 1831 Alexandre Lambert18b. 1834 Thomas Lambert 12b. 1840 ** Seraphile Lambert3b. 1849 Olympe Lambert2b. 1850
Here is the family in 1871:
1871 Census of Canada about Jbte Feie Lanbert Name: Jbte Feie Lanbert [Jbte Feie Lambert] Gender: Male Age: 67 Birth Year: abt 1804 Birth Place: Quebec Marital Status: Married Religion: Catholic Origin: French Province: Quebec District: Chambly District Number: 118 Subdistrict: St Bruno Subdistrict Number: h Household Members: Name Age Jean-Baptiste Lambert 67b. 1804 ; farmer Théoliste Lambert 48 -wife- b. 1823 Seraphin Lambert 22b. 1849 Malvina Lambert 16b. 1855 Cléophas Lambert 18b. 1853
Interestingly, Jean-Baptiste Lambert was buried in the parish of St-Basile-le-Grand:
Jean-Baptiste Lambert, d. 22 Mar, but 26 Mar 1879 St-Basile-le-Grand, husband of Theotis Guertin, age 77. Present: Jean-Baptiste Lambert, Cleophas Lambert & Fulgence Lambert.
There is no proof that this is the family of your Thomas, but it's another possibility that perhaps more closely matches your family history.Annie