I have a theory.
Anyone who has known me for longer than five seconds knows that I ship the Magic Trio together, so I do not ship FrUK (but I'm completely fine if you do ^_^'). However, I LOVE the concept of the FACE family. So what do I do? Well, because England and France never owned Canada at the same time (I can't speak for America), and they both had impacts on his culture, I think that they were probably together at one point, then divorced. One thing that I like about the theory is that there isn't really very much about people with divorced parents in the media, and when there is, it's not done realistically. If this were to be done in a tasteful way, I think that it could be very interesting. (Not to mention that it would explain Canada's inferiority complex and America's arrogance since all arrogance comes from insecurity.) I'm rather curious as to what other people think, though.