It is important to have a valid Will to avoid the challenges of intestacy – dying without a Will. Indeed, eventually, everyone ends up with a Will of one sort or other, either the deceased gets to decide how assets are distributed by writing one before death or the provincial authorities get to decide based on intestacy rules. So, it’s always best to get a Will written in advance.
The question is, do you need more than one? Getting one Will is trouble enough, so why would anyone want to have two?