以下はUSのサイトのようですが、カナダも似たような決まりだと思います。
https://finance.zacks.com/difference-between-name-houses-title-vs-its-mortgage-3318.html
Names on the Mortgage
It may sound like a good deal to have your name on a title but be absent of any legal responsibility for paying it, but you’d be wrong about that. If, for some reason, the person on the mortgage decides to stop paying, you can bet the lender will come after you for the money if your name is on the title, especially if the home is headed toward foreclosure. At the very least, they can seize the home if payments aren’t made, leaving you to make other living arrangements. If the owner does stop paying, you may be able to refinance the home in your own name, however.
For the person whose name is on the mortgage, though, the risks are even higher. If the other person is on the title, that person could legally sell his ownership in the home to someone else without your permission. This would make you co-owner of a house with someone you didn’t choose to own a home with.
第1段落からすると、配偶者を不動産名義人にするとその配偶者も連帯責任を負うことになります。
第2段落からすると、旦那さんが配偶者を共同名義人にしないのは、自衛のための知恵です。
ちなみに保険は、一定率以上の頭金を入れれば不要だったと思います。
(カナダの場合。日本の場合は知りません)
その場合ローンの名義人が死亡したらどうなるかは知りません。