House of Lancaster
Possibly Lady Margaret Beaufort, mother of Henry VII, grandmother of Henry VIII, Margaret, and Mary Tudor | Flickr - Photo Sharing!
Edmund Tudor was Margaret Beaufort's second husband, and father of her only child, Henry. Henry became Henry VII, the first Tudor monarch, so you could say that Edmund was the grandfather of the dynasty. He was born around 1430, and died in 1456, as a prisoner of the Yorkists. He was supposed to wait a few years before consummating his marriage with his child bride, Margaret. He didn't, and Margaret was only 13 when Henry Tudor was born.
EDMUND TUDOR, EARL OF RICHMOND BORN: c. 1430 DIED: 1 NOVEMBER 1456 Son of Owen Tudor and Katherine of Valois (widow of Henry V). Half-brother of Henry VI. Older brother of Jasper Tudor. Married Margaret Beaufort and fathered the future Henry VII, although Edmund died before his son was born.
Joan Beaufort (lived 1404 – 15 July 1445) was the Queen Consort of Scotland from 1424 to 1437 as the spouse of King James I of Scotland. Daughter of John Beaufort, 1st Earl of Somerset, and Margaret Holland and half-niece of King Henry IV of England. During part of the minority of her son James II (from 1437 to 1439), she served as the Regent of Scotland. Married second Sir James Stewart, the Black Knight of Lorn in 1439.
JOAN BEAUFORT (c. 1404 - 15 July 1445) 16th G GRANDMOTHER, was Queen Consort of the Kingdom of Scotland from 1424 to 1437, being married to JAMES I of Scotland. She was a daughter of JOHN BEAUFORT, 1st Earl of Somerset and MARGARET HOLLAND. Her paternal grandparents were JOHN of GAUNT, Duke of Lancaster and his mistress and later third wife KATHERINE SWYNFORD. The Castle of Stirling had been conferred by James I, upon his English bride, Lady Joanna de Beaufort as her dowry.
Joan Beaufort (c. 1404 - 15 July 1445) 18th G GRANDMOTHER, was Queen Consort of the Kingdom of Scotland from 1424 to 1437, being married to James I of Scotland. She was a daughter of John Beaufort, 1st Earl of Somerset and Margaret Holland. Her paternal grandparents were John of Gaunt, Duke of Lancaster and his mistress and later third wife Katherine Swynford. The Castle of Stirling had been conferred by James I, upon his English bride, Lady Joanna de Beaufort as her dowry.
Margaret of Scotland (French: Marguerite d'Écosse) (25 December 1424 – 16 August 1445) was a Princess of Scotland and the Dauphine of France. She was the firstborn child of King James I of Scotland and Queen Joan Beaufort. She married the eldest son of the king of France, Louis, 9th Dauphin, at eleven years old. Their marriage was unhappy, and she died childless at age 20, apparently of a fever.
Margaret Stewart, Dauphine of France (1424 - 1445). Daughter of James I and Joan Beaufort. She married the future Louis XI of France, but she had no children.
Book of Hours belonging to Margaret Beaufort, King Henry VII's mother (interactive)
House of Lancaster