Ok so, here's a scenario:
In 1519, Henry VIII dies after a tragic jousting accident, leaving a 3 year old daughter as his heir. His wife of 10 years, Catherine of Aragon, immediately brought her child to court and had her coronated as Mary I of England, Lady of Ireland. Thus, the final monarch to bear the Tudor name would begin her reign. A regency council was formed to rule until the Queen of England was of a suitable age. Although officially seperate from the regency council, Catherine of Aragon would find that she was not without influence.
The three main leaders of the council were the Dukes of Buckingham, Norfolk, and Suffolk, each of whom believed that they were entitled to head the council for various reasons. Buckingham would cite his "highborn blood" as his main reason, and would even offer to set aside his wife to marry the Queen Mother of England, if she willed it. Catherine of Aragon would politely decline the offer, and in private spoke of the rudeness of such an offer. She would, of course, never remarry and was the picture of a perfect, proper widow.
The next member of the council was the Duke of Norfolk. His position was simple, he was the eldest, had the most experience due to that and was the best positioned to help rule. He also pointed out to Buckingham, when blood was mentioned, that his son had married one of Edward IV's daughters (forgetting to elaborate that she died childless) and he held two prime positions within the government, due to his success previously.
The final member was the Duke of Suffolk, the charming Charles Brandon. His position was simply to do the best he could and that, as the husband to the Queen's aunt and (in his mind) heir, he should take the reigns of government. Brandon would also cite his close relationship with the dead King of England and his popularity with the court.
This would all grow into a fight for the Regency, boiling over in 1522, when the Duke of Buckingham announced that he was to take over the regency. He also announced that the Queen, who at this point was still loosely attached to the Dauphin, as the betrothal between the two children was delicately broken by Sir Thomas Boleyn (who would grow more important to the Regency later), would be marrying his grandson, the recently born Edward Stafford. Of course, both the regency council and Catherine of Aragon have a lot to say about that, and thus war begins. Buckingham really has no hope of winning this fight, and thus chooses to go down in battle, leaving his family to pick up the pieces. The title of Duke of Buckingham is stripped from them, and the council deems that his position will remain vacant.
This leaves Norfolk and Suffolk, along with a more active Thomas Wolsey. Wolsey, initially a lower profile in the council, having found them less receptive to him than Henry VIII of England was, now finds himself placed as a peacekeeper. He immediately looks to settle the council and actually seeks to include Catherine in the decisions more actively, hoping to use her as leverage later. Thus, when in 1523, after the Anglo/French marriage between Mary I of England and Francis, Dauphin of France is ended, he suggests a match between Mary and the King of France's second son, the Queen Mother is less vocally against it than expected. Thus, Mary is for a time betrothed to the Duke of Orleans.
In 1530, after his wife dies and he is left with two daughters and a son, Charles Brandon suggests that he marry the Queen Mother, or possibly the Queen herself, who is now of an age. He is quickly shot down and in 1532 marries granddaughter of the Duke of Norfolk, Mary Howard. Instead, in 1531, the betrothal between Mary I of England and Henri, Duc d'Orleans is ended and instead Mary is betrothed to James V of Scotland, a match to be made when she turns 16. A secret plan hatched between Catherine of Aragon and Thomas Howard, the son of the former regent who rose to his seat in 1524, around 1527, they sent his brother-in-law, Thomas Boleyn, to begin negotiations. Thus, as Catherine envisoned, he daughter would be able to join the British Isles together, which after marrying the Holy Roman Emperor or a Spanish Infante was the best match she could have hoped for. The marriage would go on to produce 4 living children, two sons and two daughters, across 7 pregnancies.
Mary I of England, Lady of Ireland (b.1516: d.1553) m. James V of Scotland (b.1512: d.1559) (a)
1a) Margaret Stewart, Princess of England (b.1535: d.1536)
2a) Henry IX of England and Ireland, I of Scotland (b.1537: d.1599) m. Eleanor of Austria (b.1534: d.1589) (a)
1a) Margaret Stewart, Princess of England (b.1555)
2a) Mary Stewart, Princess of England (b.1557)
3a) Catherine Stewart, Princess of England (b.1558)
4a) Stillborn Son (c.1559)
5a) Charles I of England, Ireland and Scotland (b.1562)
6a) Stillborn Daughter (b.1565)
7a) Magdalena Stewart, Princess of England (b.1567)
8a) Stillborn Son (c.1570)
3a) Miscarriage (c.1538)
4a) Catherine Stewart, Princess of England (b.1541: d.1574) m. Philip II of Spain (b.1527: d.1598) (a)
1a) Isabella Clara Eugenia von Hapsburg, Infanta of Spain (b.1557)
2a) Miscarriage (c.1558)
3a) Margaret von Hapsburg, Infanta of Spain (b.1560)
4a) Maria von Hapsburg, Infanta of Spain (b.1562: d.1566)
5a) Stillborn Son (c.1564)
6a) Philip von Hapsburg, Prince of Asturias (b.1566: d.1580)
7a) Joanna von Hapsburg, Infanta of Spain (b.1569)
8a) Juan III of Spain (b.1570)
9a) Miscarriage (c.1572)
5a) Charles Stewart, Duke of York and Albany (b.1543: d.1561) m. Christine of Hesse (b.1543: d.1604) (a)
1a) Catherine Stewart of York (b.1560)
6a) Stillborn Son (c.1545)
7a) Eleanor Stewart, Princess of England (b.1548: d.1572) m. Charles III, Duke of Lorraine (b.1543: d.1608) (a)
1a) Charles of Lorraine (b.1566: d.1566)
2a) Marie of Lorraine (b.1569)
3a) Francis II, Duke of Lorraine (b.1570)