First marriage of Sir Robert Willoughby, '1st Baron Willoughby de Broke', 28 February 1494/95 to Elizabeth Beauchamp, of Grafton, produced two sons.
Edward, Esq. (died 1517)
Sir Anthony, Kt.
His second marriage to Dorothy Grey, who would become Baroness Mountjoy during her lifetime through her second marriage to William Blount, '4th Baron Mounjoy they had the following children:
Richardson, Douglas (2011). Everingham, Kimball G. (ed.). Magna Carta Ancestry: A Study in Colonial and Medieval Families. Vol. I (2nd ed.). Salt Lake City. pp. 336–7. ISBN978-1449966379.{{cite book}}: CS1 maint: location missing publisher (link)
Rogers, W.H. Hamilton, The Ancient Sepulchral Effigies and Monumental and Memorial Sculpture of Devon, Exeter, 1877, pp. 346–7 & Appendix 3, pedigree of Willoughby de Broke.
Rogers, W.H. Hamilton, The Strife of the Roses and Days of the Tudors in the West, Exeter, 1890, pp. 1–36, Willoughby de Broke