Bonsoir, piperclassique,
I have a suggestion for you -- with a caveat -- because the Latin textbooks I'm familiar with are published in English, and you and your husband would be more comfortable with something in French, I'm sure.
Nevertheless, the classic textbook I recommend without hesitation is
Wheelock's Latin (now in its 7th ed.), which I used many years ago:
Wheelock, Frederic M. (1902-1987) and Richard A. LaFleur.
Wheelock's Latin. 7th ed. Collins Reference, 2011. 608 p.
ISBN 9780061997211
The book includes an Answer Key.
It was first published in 1956, and can be used as an introductory self-study Latin textbook, or for review. Its basic premise is that the best way to learn classical Latin is to read ancient authors as soon as possible.
From the beginning of the book, Wheelock includes selections from ancient authors, the "Sententiae Antiquae", which present sources of classical wisdom with accompanying translation exercises.
Some (greatly simplified) examples from Chapter 1 can be found here:
https://www.memrise.com/course/11502...sh-to-latin/1/
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If you're interested, there is a companion Reader available. However, you do not need to purchase it in order to use the main Textbook listed above.
LaFleur, Richard A.
Wheelock's Latin reader : selections from Latin literature. 2nd ed. Collins Reference, 2001. 448 p.
ISBN 9780060935061
HTH et Bonam fortunam!