Sir Thomas De Grey
Sir Thomas was born in 1359 in of Heton Wark on Tweed, Colorado, United States.¹   He died at the age of 41 on November 26th, 1400 in Wark, Northumberland, England.¹ 

 Joan De Mowbray
Joan was born in 1360 in Lincolnshire, England.¹   She died at the age of 42 on November 30th, 1402 in Hetton, Northumberland, England.¹ 

 John (Count of Tancarville) De Grey
John (Count of Tancarville) was born in 1386 in Heaton Castle,Wark-on-Tweed,Northumberland,England.²   He died at the age of 34 on March 22nd, 1420 in Baugé,Maine-et-Loire,Anjou,France.²