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Male John De Grey Click to view John De Grey in the family tree

John De was born on October 29th, 1300 in Rotherfield, Sussex, England.1   John De's father was John De Grey and his mother was Margaret Ole Oddingeseles.  His paternal grandparents were Robert De Grey and Joan De Valoines; his maternal grandparents were William DeOddingeseles and Ela Longespee.  He was an only child.  He died at the age of 58 on September 1st, 1359 in Rotherfield, Sussex, England.1 

Family Details of John De's family with Catherine Fitzalan

Family Details of John De's family with Avice Marmion

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609