*Sir Thomas Grey IV Lord of Hetton
born about 1359 Heton, Northumberland, England
died 26 November 1400

father:
*Sir Thomas de Grey III
born about 1329 Heton, Northumberland, England
died 22 October 1369

mother:
*Margaret de Pressene
born about 1333 Preston, Northumberland, England

siblings:
unknown

spouse:
*Jane (Joan) de Mowbray
born about 1363
died 30 November 1402

children:
*Agnes de Grey born about 1370 (or 1380?) Heton, Northumberland, England
died 25 October 1429 Harbottle Castle, Yorkshire, England
*Maud de Grey born about 1382 Warwickshire, England died 12 or 22 August 1451
Sir Thomas de Grey V of Heton born 30 November 1384 Castle Alnwick, Northumberland, England
died 3 August 1415 North Gate, Southampton, Hampshire, England
John de Grey Earl of Tancarville born about 1386 Wark-Upon-Tweed, Northumberland, England
died 22 March 1420/21 Battle of Bauge, Anjou, France

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com
From the dates given it seems a better fit that *Agnes was the daughter of Thomas III instead of Thomas IV.