Was just doing some work for one of Georgina's descendants and saw your posting for this family. Figured you mite like this bit of extra information I found that you appear not to have. Hope it is of some merit.
# 1 - Baptismal Record - Parish of Immaculate Heart of Mary, Garden River, Ontario Theophile TESSIER, son of Theophile TESSIER and Angele DUBOIS of Mississagi, ne - July 27, 1868, b - July 27 at Mississagi. P - Asaire LaplanteM - Florence Caslet Theophile was baptised by a missionary priest from the church in Garden River named Richard Baxter. Source - LDS Film# 1311345, Item 6, Page 91
# 2 - Baptismal Record - Parish of Immaculate Heart of Mary, Garden River, Ontario Guillaume Honore TESSIER, son of Theophile TESSIER and Adelaide CAZELET, ne - June 12, 1896, b - June 21 at Algoma Mills. P - Seraphin DesrosiersM - Ida Tessier Source - LDS Film# 1311345, Item 8, Page 172
I think this is the son you show as William-Henri, born in 1895. I double checked this entry and it is 1896.
At first I couldnt figure out where you got the surname of Theophiles second wife until I saw the Census where it showed her father as being Soloman Causley. However, in most cases in the church records for Garden River her name is shown as Cazelet, which I believe is the rite one. Also his first wife in all the entries for Garden River is shown as Dubois, not Dubay which is another French family name. It appears to me that her father is in fact Joseph-Soloman Cazelet and her mother Jane Biel. I think that both Causley and Casela are corruptions of her family name Cazelet and were written down phonetically by both the census taker and also the priest. Below is a transcription of the marriage of Theophile to his second wife.
# 3 - Sacred Heart Church, now Precious Blood Cathedrale, Sault Ste. Marie, Ontario Theophile TESSIER, son of Pierre TESSIER and Catherine CARRIER of St-Benoit, widower of Angele DUBAY, married on April 19, 1875 to Adelaide CASELA, age 20, dtr of Joseph CASELA and Jane BIEL, residents of Mississagi. Witness's - Edouard Sayer and Joseph Casela Source - LDS Film# 1311344 Item 1
I hope some of this data is of value to you. I have informed the descendent of Georgina Tessier of your email address and I hopefully he will contact you in the future to add more info to this family that you mite not have.