Hi. I'm not related to this family. Here is Fortunat's baptism from the Quebec, Vital and Church Records (Drouin Collection), 1621-1967:
Asarias Fortunat Cadieux, b. 2 Jul, bap 4 Jul 1895 St-Mathias, Rouville County, Quebec, son of Napoleon Cadieux & Rosalie Lasnier.-godparents- Fortunat Rainville & Georgiana Morier, his wife.
Here is a marriage for his parents:
Napoleon Cadieux (Eusebe Cadieux & Zoe Dasignon) m. 1 Feb 1881 Marieville (St-Nom-de-Marie and Ste-Marie-de-Monnoir), Quebec Rosalie Lasnier (Nazaire Lasnier & Rosalie Bedard, deceased, of Ste-Brigitte)
According to a tree on Ancestry, Louis Edouard Cadieux was the son of Edouard Cadieux (1850-1932) & Agnes Belliveau (1859-1947).
Edouard may have been the son of Eusebe & Zoe.Here is that family in 1851:
1851 Census of Canada East, Canada West, New Brunswick, and Nova Scotia about Edouard Cadieux Name: Edouard Cadieux Gender: Male Age: 2 Estimated Birth Year: abt 1850 Birthplace: Canada Born of Canadian Parents: Yes Province: Canada East (Quebec) District: Rouville County District Number: 25 Sub-District: St Mathias Sub-District Number: 340 Household Members: Name Age Eusebe Cadieux37b. 1815 Quebec Zoe Davignon-wife-30b. 1822 Que Trefle Cadieux12b. 1840 Que Zoe Cadieux10b. 1842 Que Constance Cadieux6b. 1846 Que Elmire Cadieux4b. 1848 Que Edouard Cadieux 2b. 1850 Que ** Napoleon Cadieux1b. 1851 Que **
Here is a baptism for Edouard:
Edouard Cadieux, b. 8 Aug, bap 9 Aug 1849 St-Mathias, son of Eusebe Cadieux & Zoe Davignon.
According to the 1871 Census, Edouard & Napoleon were still living with their parents in Rouville (Ste-Marie).
Here is a naturalization record that matches Edouard's birth date:
U.S. Naturalization Record Indexes, 1791-1992 (Indexed in World Archives Project) about Edouard Cadieux Name: Edouard Cadieux Birth Date: 8 Aug 1849 Birth Place: Great Britain [sic] Age at event: 37 Court District: Holyoke Mass. Police Court Hampden County Date of Action: 21 Oct 1886
Possibly then Louis Edouard & Fortunat were 1st cousins. Hope this helps.Annie