I’ve thought for ages that Cora probably had something to do with the cursing of George’s wife, though I’d had a whole theory of lover’s revenge behind it all, which I’m now thinking isn’t likely.
It’d make sense if she curse someone ahead of them in line to the throne to not have kids. I think it’d have to be that George had married into that family though, (unless he was adopted, which I don’t think is likely), because he’s not the right nationality to fit in as a blood relation, but if Henry had an older sister, he could have married her. Problem with that theory though is that George’s family crest doesn’t match King Xavier’s in the slightest.