| holds title earl of Somerset |
| holds title marquess of Dorset |
| holds title marquess of Somerset |
| is child of John of Gaunt, 2nd duke of Lancaster |
| is child of Swynford, Katherine, duchess of Lancaster |
| is parent of Beaufort, Edmund, 2nd duke of Somerset |
| is parent of Beaufort, John, 1st duke of Somerset |
| is sibling of de Beaufort, Joan, countess of Westmorland |
| is sibling of Beaufort, Thomas, 2nd duke of Exeter |
| is sibling of Beaufort, Henry, cardinal of England, bishop of Winchester |
| is spouse of Holland, Margaret |
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