I'm afraid I've had no luck finding a marriage between Dosithee Mailloux and Adeline Gauthier.
Maybe some of what I found will be useful.
Dosithee Mailloux and Adelina/Delima Gauther
Dosithee Mailloux, son of Joseph and Emelie Perron, was baptized 23 Mar 1852, St Damase, St Hyacinthe, Quebec and died 20 October 1897 in Cyprien Lake, United States.He was buried three days later in St Felix de Valois, Cheneville, Papineau, Quebec. His parents Joseph Mailloux and Emily Perron were married 5 Jul 1831 at St Mathias, Rouville, Quebec. (
Dosithee married Adeline/Delima Gauthier abt 1871, most likely in Clinton County, New York where Adeline lived.
Adelina Gauthier, daughter of Eusebe and Justine Chalut,was born 12 Aug 1850 in Clinton, New York. Probably Clinton County rather than the town of Clinton which is in Southern New York.Clinton County borders Canada.
Eusebe Gauthier, son of Louis and Victoria Maisonneuve, was born 13 Feb 1820 in Terrebonne, Quebec and died after 1875 in Hogansburg, New York.He married Justine Christine Chalut 14 Oct 1839 in Ste Martine, Chateauguay, Quebec.Justine was the daughter of Michel and Louise Loisel and was born 12 Sep, 1821 in Vercheres, Quebec.
Known children of Eusebe Gauthier and Justine Chalut were
-Adele Marie Gauthier, b. Aft. 1839; d. Aft. 1864, married Gilbert Ferriere on 28 Mar 1864, at St Patrick's,Chateauguay, Franklin, New York. He was the son of Francis and Julie Giroux.
-Jacob Gauthier, born abt 1841, born in US, died after the 1871 census for Ste Angelique, Papineau, Quebec.
-Adelina Delima Gauthier, b. 12 Aug 1850, Clinton, New York,d. January 16, 1926, St Anne, Sudbury, Ontario; m. (1) Dosithee Mailloux abt. 1871; b. March 23, 1852, St Damase, St Hyacinthe, Quebec, and d. October 23, 1897 at Cyrian Lake, USA; buried Cheneville, Papineau, Quebec. m. (2) GILBERT PAQUETTE, July 12, 1906, Algoma, Balfour, Ontario,b. Abt. 1851; d. May 04, 1921, Chelmsford, Sudbury, Ontario
-Nancy Anne Ange Gauthier,b. Abt. 1856, in USA per census; d. Aft. 1901, on 1901 census for Balfour, Chelmsford and Unorganized Territory/Territoire Non-Organisé; m. Antoine Sanscartier, January 07, 1875, St Andre Avellin, Papineau, Quebec He was the son of Hercule Sanscartier; d. Aft. 1901, on 1901 census for Balfour, Chelmsford and Unorganized Territory
-Jacques Gauthier, b. Abt. 1859 in USA per census; d. Aft. the 1871 census for Ste Angelique
-Frederic Gauthier, b. February 01, 1864, St Patrick, Chateauguay, Franklin, New York; d. Aft. the 1871 census for Ste Angelique
Known children of Dosithee Mailloux and Adelina (Delima) Gauthier:
-Marie Cornelie Mailloux, b. 27 Aug 1873, Montebello, Papineau, Quebec
-Delia Mailloux, b. abt 1874 m. (1) Adrien Daoust, August 04, 1890 at Cheneville, Papineau, Quebec.He died November 28, 1907 at Algoma, Balfour, Ontario.She married (2)Napoleon Paquette, on August 08, 1915 at Sudbury, Ontario
-Dosithee Mailloux, b. 11 Mar 1876, Chenevelle, Papineau, Quebec married Emerilda Regimbal on September 03, 1900 at Sudbury
-Exilda Mailloux, b. c. 1880, d.7 Feb 1886
-Marie Delina Mailloux, b. 8 Jun 1881, Chenevelle, Papineau, Quebec; married Delphis Thibault November 03, 1902 at Sudbury
-Joseph Polydore Mailloux, b. 20 Mar 1883, Chenevelle, Papineau, Quebec
-Rose Emma Mailloux, b. December 06, 1884, Chenevelle, Papineau, Quebec; d. 8 Nov1896, Chenevelle, Papineau, Quebec.
-Sara Mailloux, b. April 18, 1886at Cheneville, Papineau, Quebec , m. Alphonse Dubois February 02, 1903 at Sudbury
-Marie Mailloux, b. 8 Apr 1888, Chenevelle, Papineau, Quebec; d. 25 Apr 1888, Chenevelle, Papineau, Quebec
-Joseph Alfred Edmond Mailloux, b. May 22, 1891, Chenevelle, Papineau, Quebec, d.10 Sep 1891 St Felix de Valois, Chenevelle, Papineau, Quebec
- Joseph Henry Mailloux born February 10, 1894 at Cheneville, Papineau, Quebec