She was born on the Gaspé Peninsula, in Saint-Bernard-des-Lacs, Quebec, as was her husband, Adhémar-Charles Dion.
[1] Her parents were Antoinette (née Sergerie) and Laureat Achille Tanguay.
[2] Already well known in Quebec as a stage mother involved in her daughter's career, she later launched her own line of food products, Pâtés de Maman Dion, and became host of a cooking show for TVA in 1999.
[3][4] She was also a sponsor of the Fondation Maman Dion which was founded in 2006,[5] an educational foundation which provides school supplies, clothing and eyewear to underprivileged children.
[6] Thérèse and Adhémar had 14 children:[7] After several months of experiencing health issues, Thérèse Tanguay-Dion died at her home in the Saint-Rose neighborhood of Laval, Quebec on 17 January 2020, at the age of 92.