That's interesting. When someone applies for a visa to visit Canada in the first place, most individuals have an invitation letter from a person in Canada who's inviting them for the visit, whether it's for business purposes or personal. Those invitation letters are not enforceable. A person can say, of course, that they want to invite their brother to come to visit them for six months, and they guarantee you that he's going to go back home; but at the end of the day, you're dealing with another adult person. There's no way that a Canadian or permanent resident could really guarantee what someone else is going to do, so I'm not sure that any kind of enforceable undertaking would really work in that scenario. I just don't think it's possible logistically to have some enforceable mechanism whereby you're responsible for the conduct of another grown adult. I don't see how that would work.
On October 27th, 2020. See this statement in context.