There are a few MPs out there with multiple parents. Certainly that isn't an optimal situation, but at least it narrows down the field to a few possibilities.
But I agree, the situation needs to be better researched, so that we can settle on one set of parents. Personally, I can revisit this a bit later (after I finally get over the Andes into Argentina... winter is here, it seems), but last I remember, there were three prospects with equally valid sources (basically no sources other than assertions in different family trees).
Certainly if anyone has found more sources that supports any of the candidates, I'd be happy to take out my ax and chop up the tree. Just want to know that I'm chopping off the errant branches before I do that...