Nielsen Hayden genealogy
Family: William de Grandison / Sibyl de Tregoz (F237)
m. Bef 1286-
Father | Male
William de Grandison
Born Abt 1243 of Ashperton, Ledbury, Herefordshire, England 
Died 17 Jun 1335 Buried Married Bef 1286 [1, 2, 3, 4] Father Pierre de Grandison | F1974 Group Sheet Mother Agnès de Neufchâtel | F1974 Group Sheet
Mother | Female
Sibyl de Tregoz
Born Abt 1272 Died 21 Oct 1334 Dore, Herefordshire, England Buried Dore Abbey, Herefordshire, England Father John de Tregoz | F1991 Group Sheet Mother Mabel Fitzwarine | F1991 Group Sheet
Child 1 | Female
+ Mabel de Grandison
Born of Ashperton, Ledbury, Herefordshire, England Died Aft 1350 Buried Grey Friars, Bedford, Bedfordshire, England Spouse John de Pateshulle | F6161 Married Bef 1313
Child 2 | Female
+ Katherine de Grandison
Born Died 23 Apr 1349 Buried Spouse William de Montagu | F11244 Married Bef 1328
Child 3 | Female
+ Agnes de Grandison
Born Died 3 Dec 1348 Buried Spouse John de Northwode | F12966 Married Bef 1307
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Sources - [S789] The Wallop Family and Their Ancestry by Vernon James Watney. Oxford, 1928.
- [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.
- [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008.
- [S1526] The Ancestry of Dorothea Poyntz, Wife of Reverend John Owsley, Generations 1-15, Fourth Preliminary Edition, by Ronny O. Bodine and Bro. Thomas Spalding, Jr. 2013.
- [S789] The Wallop Family and Their Ancestry by Vernon James Watney. Oxford, 1928.