It's my mistake, I thought that protectorate of York lasted for a year. Actually it lasted for two years, and I think it just won't be enough time for York to marry her to one of his sons and get them to consummate, IOTL Henry Tudor was born in 1457 and Edmund was a lot older than Margaret, I don't think that Edward of March/Edmund of Rutland will consummate the marriage until York's protectorate ends.
They'll get married easily enough.
York's protectorate lasted till 1455, when both Margaret and Edmund/Edward would be ~12 (if Edmund) or 12 and 13 (if Edward). While quite certainly waiting for a couple of years is preferable, it isn't out of the realm of possibility that they do consummate the marriage (or just quite simply pretend to do so, by spreading some blood on the bedsheets)
Otherwise, assuming they don't consummate by 1455, nor do they go with staining the bedsheets, getting their marriage to be annulled will be much more harder without essentially commiting political (and military, for that matter) suicide. The Suffolk and Somerset matches are simple enough, the majority if their power came from the king. York, OTOH, is a monster in his own right.
Weren't there half-sisters IOTL that didn't amount to much? Or did they die young?
On the discussion that's going on- Henry's preference (and Margaret's) will be for Margaret Beaufort to marry a son of their favourite Somerset, which has the added benefit of reuniting all the Beaufort properties (...and maybe means they don't have to lavish as much patronage on Somerset ITTL?).
The question is whether York is bold enough to snag her for one of his sons during the Protectorate, and whether that marriage holds up when Henry returns to health.
I think there was one that became a nun?
Certainly the preference will be for the Beauforts. I don't see why Somerset wouldn't be as patronised ITTL, especially if he's still essentially sucking upto them.
Given his nature, York doing so isn't the problem.
I'd say it would, perhaps not as easily as I first thought, but likely it does "hold up".
From what I know there was only one sister, Margaret, she was born in 1437 and died shortly afterwards.
Are there any male Beauforts available for one of the sisters?
ATL Jasper (aka Catherine ITTL, AFAICT) is 5 years older than the eldest Somerset kid. He's where the line would be drawn IMO.
Edit:
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