WI: Arthur of Wales has issue, still predeceases Henry VII?

So after Henry VII ascends the English throne and ends the Wars of the Roses he immediately begins building up relations with the rest of Europe by marrying his children off: Arthur married Catherine of Aragon and Margaret marries James IV of Scotland.

In our world Arthur died without producing children, which made it easier to marry Catherine to Arthur's brother Henry, who became Henry VIII and we all know how it turned out.

So, instead, what if some way or another Catherine gives birth to a kid but Arthur still ends up dying young? With Henry moved down the line of succession (but still heir to Arthur and Catherine's kid) how will this move things?
 
Henry becomes regent until the little one is 18 (or is it 21)?
More likely Henry will be regent until his nephew will be 14/16...

So after Henry VII ascends the English throne and ends the Wars of the Roses he immediately begins building up relations with the rest of Europe by marrying his children off: Arthur married Catherine of Aragon and Margaret marries James IV of Scotland.

In our world Arthur died without producing children, which made it easier to marry Catherine to Arthur's brother Henry, who became Henry VIII and we all know how it turned out.

So, instead, what if some way or another Catherine gives birth to a kid but Arthur still ends up dying young? With Henry moved down the line of succession (but still heir to Arthur and Catherine's kid) how will this move things?
A son of Arthur and Catherine would replace his father as heir, but if they had only a daughter, she would be most likely considered a too big risk for the stability of the English crown with only two alternatives for her: convent or marrying uncle Henry aka the new Prince of Wales
 
I wrote a story where Arthur and Katherine had a daughter once, born in 1505/6, before Arthur died in 1508. Henry was already married at that point, and far too old for her anyway, so I decided to do what was done to the Welsh princesses after the Conquest in the 1280s, and shoved little Isabella of Wales into Barking Abbey to be raised as its future Abbess. And yes, I did give Henry VIII a son with his first wife, so no Dissolution. :)
 
If Arthur only has a daughter and Henry VIII is already married could you see Arthur's daughter (likely called Isabella/Elizabeth, Mary, Margaret, or Katherine)married off to the first son of Henry VIII provided the age gap isn't too bad?

If it's a boy (likely called Henry, though Arthur and Edward are outside possibilities), who gets the young King's regency? Henry is the most senior adult male in the family, but I could see Henry VII, Elizabeth of York (who lives longer ITTL by never having her last pregnancy), and Margaret Beaufort getting paranoid by the potential Edward V-Richard III parallels and installing Henry and Katherine as co-regents to ensure both male leadership and someone who will guard the young king's place on the throne.
 
If Arthur only has a daughter and Henry VIII is already married could you see Arthur's daughter (likely called Isabella/Elizabeth, Mary, Margaret, or Katherine)married off to the first son of Henry VIII provided the age gap isn't too bad?

If it's a boy (likely called Henry, though Arthur and Edward are outside possibilities), who gets the young King's regency? Henry is the most senior adult male in the family, but I could see Henry VII, Elizabeth of York (who lives longer ITTL by never having her last pregnancy), and Margaret Beaufort getting paranoid by the potential Edward V-Richard III parallels and installing Henry and Katherine as co-regents to ensure both male leadership and someone who will guard the young king's place on the throne.
Yes, if the age gap consent a wedding between Arthur’s daughter and Henry’s son would absolutely be in the cards as it would work much better than any other solution...
A son of Arthur and Catherine born after his father’s death will be likely called Arthur, if he is born before then Henry is the favored name followed by Edward and Arthur...
Henry will be Regent for his nephew but Katherine will keep custody of her son
 
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