Last year, Tanguay-Dion's eldest child Claudette revealed that her mother had been suffering from memory loss, as well as vision and hearing impairment. An official cause of death has not been announced.
Tanguay-Dion was affectionately known in her home province of Quebec as "Maman Dion."
In addition to mothering 14 children, Tanguay-Dion was also a television host and a philanthropist.
She hosted a cooking show on TVA and released her own line of food products under the banner Pâtés de Maman Dion.
In 2006, she founded the Maman Dion Foundation, which provides school supplies, clothing and glasses to underprivileged students.
She even wrote daughter Céline's first hit, "Ce n'était qu'un rêve."
Read some of the remembrances for Maman Dion below.
Triste d'apprendre le décès de Thérèse Dion, Maman Dion pour tous les Québécois. Une femme remarquable, si généreuse, si aimante, qui a consacré sa vie entière au bien-être de sa famille. Notre grande famille québécoise pleure son départ. Toutes mes condoléances à la famille Dion— François Legault (@francoislegault) January 17, 2020
Our thoughts are with the family and friends of Thérèse Dion.— Jagmeet Singh (@theJagmeetSingh) January 17, 2020
Lovingly referred to as Maman Dion, her work to help low income families will be remembered by many.
Our condolences to the Dion family.
I just learned that Thérèse Dion died this morning. I am shocked and sad. She was the mother of a family and of a whole province.— Mel ♊️ (@HtnMelvin) January 17, 2020
I send my condolences to @celinedion and to the whole Dion family#CelineDion #MamanDion
So Very Sad. 💔 https://t.co/z70KIX0m5d— Gina Stango (@GinaStango) January 17, 2020
We only have one mother, and the one who raised and accompanied one of the greatest voices on the planet just passed away. All my condolences to the Dion family.https://t.co/OBAiT0E800— Steven Guilbeault (@s_guilbeault) January 17, 2020
Thérèse Dion left us. But we just have to thank her. We should say thanks twice.— Henry (@HenryIzzi) January 17, 2020
For bringing Celine into this world and for faithfully believing her talent from the beginning. Rest in peace.
Our thoughts are with the Dion Family. 🌼#Celine #CelineDion #MamanDion #RIP pic.twitter.com/CivXpwxWgk