Jean-Baptiste Beaudoin married Marie-Malvina Mathieu on May 19, 1873 in Ste-Sophie-d'Halifax, Mégantic, Québec.
His parents are shown as Louis Beaudoin & the late Geneviève Bolduc. They were married on Aug 9, 1836 in St-Michel-de-Bellechasse, Bellechasse, Québec.
Marie-Malvina's parents are Isidore Mathieu & Marie-Marcelline Gagnon. They were married on August 19, 1845 in Ste-Claire, Dorchester, Québec.
Jean-Baptiste was born on August 28, 1849 in St-Norbert (Norbertville), Arthabaska, Québec, and was baptized the next day. He died between September 1895 and July 1900. There is a John Beaudoin who died in Newmarket, NH on May 5, 1898 that may be him.
Marie-Malvina was born on May 29, 1853 in Ste-Sophie-d'Halifax, Mégantic, Québec, and was baptized the next day in St-Norbert, Arthabaska, Québec. She remarried twice after Jean passed. She died on February 4, 1925 in St-Paul-de-Chester, Arthabaska, Québec, and was buried there on February 7th.
I suggest using the Drouin Collection here on Ancestry, the Quebec Parish Collection on FamilySearch.org or a pay database like bms2000 if you want to find further information.