Scotland in the Age of the Yorks:
James IV,
King of Scots [1488-1523] (1473-1523) 1m: 1485 Cecily of York (1469-1503); 2m: 1505 [1] Elisabeth of the Palatinate (1483-1522)
[1m.] Margaret (1489-1544) m: 1505 [2] John, 2e Duke of Albany (b.1484)
3e Duke of Albany
James, 4e Duke of Albany (1532-1596) m: 1562 Christine, Queen of Scots (1537-1600)
[1m.] James V, King of Scots [1523-1550] (1491-1550) 1m: 1508 Marguerite de France [3] (1494-1512); 2m: 1515 Amalie of Cleves-Ravenstein [4] (1495-1561)
[1m.] Stillborn Son (1512)
[2m.] James, Earl of Galloway [5] (1518-1520)
[2m.] Cecily (1521-1564) m: 1538 Philipp II, Elector Palatine of the Rhine [6] (1517-1580)
Sibylle (1540-1546)
Ludwig (1541-1543)
Rupprecht IV, Elector Palatine of the Rhine (1542-1591) m: 1560 Anne of York [10] (1541-1603)
Stillborn Daughter (1545)
Philipp, Count Palatine of Sponheim (1547-1599) m: Princess of Cleves
Elisabeth (1550-1609)
Cäcilie (1542-1612)
[2m.] Stillborn Son (1522)
[2m.] Robert, Duke of Rothesay (1524-1546) m: 1535 Kristina of Denmark, Sweden & Norway [7] (1521-1590)
Christina, Queen of Scots (1537-1600) 1m: 1550 Charles, Duke of Fife [8] (1529-1560); 2m: 1562 James, Duke of Albany [8] (1542-1596)
[1m.] Margaret (1554-1589) m: ?
[1m.] Stillborn Son (1556)
[1m.] Christine (1559-1591) m: England
[2m] James VI, King of Scots [from 1600] (b.1562) m: England
[2m.] Isabella (b.1563)
[2m.] Charles, Duke of Albany (b.1564)
[2m.] Christian, Duke of Fife (b.1569)
[2m.] Anne (b. 1573)
James, Earl of Galloway [5] (1538-1539)
Charles, Earl of Galloway (1540-1543)
Isabella (1542-1589) m:
Dorothea (1545-1600) m:
[2m.] Elizabeth (1527-1583)
[1m.] Mary (1494-1496)
[1m.] Isabella (1497-1557) m: 1513 Johann, Elector of Saxony [9] (1468-1532)
Ernst II, Elector of Saxony (1515-1569) m: 1535 Dorothea of Denmark, Sweden & Norway [7] (1520-1580)
Johann Christian, Elector of Saxony (1539-1599) m: 1558 Margaret of York [10] (1543-1606)
Stillborn Daughter (1541)
Isabella (1543-1586) m: ?
Dorothea (1544-1601)
Ernst Wilhelm, Duke of Coburg (1546-1588)
Stillborn Daughter (1548)
Christine (1551-1587)
Stillborn Daughter (1518)
Friedrich (1521-1543)
Johann Jakob, Duke of Weimar (1523-1586) m: ?
Elisabeth (1525-1577)
Stillborn Daughter (1528)
[1m.] Edward (1498-1500)
[1m.] Stillborn Son (1500)
[1m.] Cecily (1503-1549) m: ?
[2m.] Robert, Duke of Fife (1506-1541) m: 1522 ?
Charles, Duke of Fife (1529-1561) m: Christine, Queen of Scots (1537-1600)
[2m.] Annabella (1508-1553)
[1] Norman MacDougall mentions that James sought to extend Scots' influence in Europe, especially in the Rhineland and the Low Countries. The widowed landgravine of Hesse, sister of the pro-French Elector Palatine, Ludwig V. would be a coup. This would be before Ludwig marries Emperor Maximilian's niece, so he could still be viewed as a French proxy
[2] James decides this match after his younger son dies. The main reason is how "thin" the Stewart line is looking.
[3] daughter of Charles VIII and Elizabeth of York
[4] daughter of Philipp of Cleves, Herr von Ravenstein and his TTL wife
[5] James is the first male-line grandson of a king of Scots born since the reign of King Robert II, he's granted the title of "earl of Galloway"
[6] son of Ludwig V and Sibylla of Bavaria, his mom dies in childbirth
[7] How does OTL Isabella of Austria still exist here? Simple. The dowry required to get Anne of York to be duchess of Burgundy/future empress would've likely been staggering. Edward IV, when he died, left a near empty treasury. Chances are good that it was a while before they could make up that - meaning Anne and Katherine likely got much lower matches than planned OTL.
[8] slight explanation here: when left with only male-line granddaughters, James V does
not change the Succession Laws of Scotland by smashing King Robert's entail. Mostly because he knows that it will lead to nothing but civil war or an attempt by England to engage Christine to the prince of Wales. Instead, he takes a different approach. He summons the Scots parliament and has them acknowledge Christine as his heiress. He ties this acknowledgment to her marrying her to the duke of Fife's heir (i.e. the one who would inherit the throne after King James V's death anyway) to allay Scottish xenophobia. The lairds are perhaps not entirely happy about it, but James V is not the sort of man they want to piss off. Even when dead. So they grumble about it being "irregular" but most are just grateful that it's avoiding the civil war that will inevitably result if the king dies without such a proviso and his heiress is a daughter. The English might start getting ideas.
When the duke of Fife dies only leaving daughters, the Scots parliament "obliges" the crowned Christine to accept
their candidate: the duke of Albany's heir. "Rather that witless fool than an English prick", in the words of a contemporary. They realize afterwards that they should've taken the English dick. Because they deliver into their queen's hands not only a husband, but also a stick she can use to hit them back into line with. Due to Fife dying with no male heirs, his lands return to the crown- much to the grumbling of his relatives who feel they didn't get quite as much out of the royal connection as they hoped. United with Albany's own lands, Christine becomes the Scottish monarch with the largest footprint since James I's reign. And that Albany is a decent soldier, rigidly loyal to his wife- he's got a whole family history of backstabbing the crown, so he knows that any misstep is going to be seized upon- and, once his son is born...here to stay, scares enough Scots lairds into open rebellion. Where Albany shows them just how "witless" and ruthless he is in defending both his wife and both the crown his son will one day wear.
[9] Johann's eldest son dies of a childhood illness, and at Emperor Maximilian's "suggestion", the negotiations for Isabella to marry the duke of Guelders are broken off and the marriage to Johann arranged instead
[10] daughters of Richard of Shrewsbury's namesake grandson, the 3e Duke of York. The 3e duke is married to King Richard III (son of Edward V)'s daughter. The duchess' nephew, the prince of Wales (and future Richard IV) is the prince of Wales they were concerned about marrying Christine. It's Richard IV's kids who marry Christine's.