Family: Sir Thomas IV "Crooked Foot" De Grey, Baron Grey of Heaton, KG / Lady Joan De Mowbray, Baroness Grey of Heaton

Maternal line Sir Thomas IV "Crooked Foot" De Grey, Baron Grey of Heaton, KG
Margaret Pressen Or Fresfen 1332 - 1383  (51 years)	_	Sir Thomas Grey 1328 - 1369  (41 years)

Maternal line Lady Joan De Mowbray, Baroness Grey of Heaton
Duchess Elizabeth Segrave 1338 - 1398  (59 years)	_	John ( 4rh baron Mowbray of theisk) de Mowbray 1340 - 1368  (28 years)