Hi Joanne.I'm not related to this family.Looking at Christine's marriage record found in the Quebec, Vital and Church Records (Drouin Collection), 1621-1967, this is what I read:
Emmanuel Ferdinand Couillard (Emmanuel Couillard & Octave Dehaitre) m. 9 Jan 1877 Thurso (St-Jean-L'Evangeliste), Papineau County Christiane Lamothe (Louis Lamothe & Christiane Chenier)
Here is Christine's baptism:
Christine Lamothe, b. 17 Sep, bap 21 Sep 1856 St-André-Avellin, Papineau County, Quebec, daughter of Louis Lamothe & Christine Chenier -godparents- William Chenier & Rosalie Labourier.
And for some of her siblings:
Gustave David Lamothe, b. 23 May, bap 30 May 1858 St-André-Avellin, son of Louis Lamothe & Christine Chenier -godparents- Francois-Xavier Chene & Rose Bellanger.
Adelina Lamothe, b. 17 Dec, bap 21 Dec 1861 Papineauville, (St-Angelique), Papineau County, Quebec, daughter of Louis Lamothe & Christine Chenier -godparents- Cyrille Couville? & Marguerite Chenier.
And Adelina's twin sister,
Emilie Lamothe, b. 17 Dec, bap 21 Dec 1861 Papineauville, (St-Angelique), daughter of Louis Lamothe & Christine Chenier -godparents- Louis Chenier & ?
Joseph Lamothe, b. 5 Mar, bap 13 Mar 1864 St-André-Avellin, son of Louis Lamothe, living in Reipon, & Christine Chenier. -godparents- Gregoire Malette & Julie Girard.
She also had a brother Louis Lamothe who married Celina Binette, daughter of Narcisse Binette & Marie Dubois on 9 Sep 1876 in Thurso..
Unfortunately the parish records in Papineauville are sometimes not legible, so that may be why there is a problem finding the record you seek.
This is probably the family in 1871:
1871 Census of Canada about Louis Lamothe Name: Louis Lamothe Gender: Male Age: 42 Birth Year: abt 1829 Birth Place: Quebec Marital Status: Married Religion: Catholic Origin: French Province: Quebec District: Ottawa East District Number: 95 Division: 01 Subdistrict: Lochaber Subdistrict Number: a Household Members: Name Age Louis Lamothe 42b. 1829 Que.; laborer Christena Lamothe34 -wife- b. 1837 Que. Louis Lamothe 14b. 1857 Que. Xavier Lamothe 16b. 1855 Que. Christena Lamothe14b. 1857 Que. ** David Lamothe 12b. 1859 Que. Amelia Lamothe9b. 1862 Que. Adelein Lamothe9b. 1862 Que. Joseph Lamothe 7b. 1864 Que. Delfice Lamothe3b. 1868 Que. Juliá Lamothe 11 monthsb. May 1870 Que.
This family ended up in Michigan as you probably already know:
1880 United States Federal Census about Louis Lamaut Name: Louis Lamaut Age: 50 Birth Year: abt 1830 Birthplace: Canada Home in 1880: Bay City, Bay, Michigan Race: White Gender: Male Relation to Head of House: Self (Head) Marital Status: Married Spouse's Name: Christine Lamaut Father's Birthplace: Canada Mother's Birthplace: Canada Neighbors: View others on page Occupation: Lumberer Household Members: Name Age Louis Lamaut 50b. 1830 Canada; Lumberer Christine Lamaut 44 -wife- b. 1836 Canada Louis Lamaut 28-son- b. 1852 Canada; Lumberer Exavia Lamaut 25-son- b. 1855 Canada; Lumberer Adaline Lamaut 17-dau- b. 1863 Canada; Servant Emily Lamaut 17-dau- b. 1863 Canada; Servant Julia Lamaut 10-dau- b. 1870 Canada Joseph Lamaut 15-son- b. 1865 Canada; Woodman Celina B. Lamaut 25 -dau in law- b. 1855 Canada; Boarding Maggie Lamaut 7m-dau- b. Dec 1879 Canada
A public family tree has the following info:
Louis Lamothe (Jean-Baptiste Lamothe & Marie Rose Marion) m. Christine Chenier (Louis Chenier & Angelique Brunet)
If so, here are the next marriages in the lines:
Jean Lamotte (Jean Lamotte & Charlotte Laforge) m. 13 Aug 1822 St-Jacques-l`Achigan, Montcalm County, Que. Marie Rose Marion (Antoine Marion & Elizabeth Dupuis)
Louis Chenier (Joseph Chenier & Marie Rose Brabau?) m. 17 Jan 1814 Les Cèdres (St-Joseph-de-Soulanges), Soulanges County, Quebec Marie Desanges Brunette dite Bourbonnaise (Paul Brunette dit Bourbonnaise & Marie Josephte Lalonde)
There is a baptism for Louis Lamotte/Lamothe that matches:
Louis Lamotte, b. 24 May, bap 25 May 1830 St-Jacques-l`Achigan, son of Baptiste Lamotte & Marie Rose Marion. -godparents- Germain Terriot, cousin of the baby, & Louise Leblanequi?
Jean, Jean-Baptiste & Baptiste were sometimes used interchangeably in the parish records..