A timeline where Juan, Prince of Asturias lives.
King Juan III (1478-1529), reigned from 1511 in Castile and 1519 in Aragon, M. Margaret of Austria (1480-1530), had issue:
1. Infanta Isabella of Castile (1498-1531) M. King Miguel I of Portugal (1498-1556), had issue:
1 (A). Infanta Isabella of Portugal (1519)
1 (B). Infanta Margarida of Portugal (1521)
1 (C). King Miguel II of Portugal (1523)
1 (D). Infante Joao of Portugal (1526)
2. Infanta Margarita of Castille (1500-1561) M. Holy Roman Emperor Charles V (1500-1553), had issue:
2 (A). Archduchess Margaret of Austria (1519)
2 (B). Archduchess Joanna of Austria (1523)
2 (C). Holy Roman Emperor Philip II (1525)
2 (D). Archduke Charles of Austria, later King of Bohemia and Hungary (1528)
2 (E). Archduchess Elizabeth of Austria (1530)
3. King Ferdinand VI and III of Castile and Aragon (1503-1564) reigned from 1529 M. Claude of France, Duchess of Brittany (1499-1534), had issue:
3 (A). Infante Juan, later King Juan IV (1526-1592)
3 (B). Infante Carlos, later king-consort Carlos of Navarre (1529)
3 (C). Infante Ferdinand, later King consort of England (1530)
4. Infante Alfonso, Duke of Granada (1506-1566) M. Susanna of Bavaria (1503-1574), had issue:
4 (A). Lady Margarita (1530)
4 (B). Lady Isabella (1534)
4 (C). Lady Susanna (1537)
.......
So I had Miguel de Paz live in this scenario because, reasons? Also Queen Mary I of England, still becomes Queen. John stops Henry from divorcing Catherine and threatens war if he does. Hence why we have Infante Ferdinand, King consort of England. Jeanne of Navarre still becomes Queen which is why Carlos, King Consort of Navarre is a thing.