John De Grey & Avice Marmion 
John and Avice were married in a religious ceremony about 1342. They had two sons named John (De Grey) and Robert.
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Personal Details
John De Grey
John was born on October 29th, 1300 in Rotherfield,Sussex,ENGLAND. He died at the age of 58 on September 1st, 1359 in Rotherfield,Sussex,ENGLAND.
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Children
John (De Grey) Marmion
John (De Grey) was born in 1343 in Rotherfield,Oxfordshire,ENGLAND. He died at the age of 25 on October 25th, 1368 in SPAIN.
Robert Grey
Robert was born about 1345 in Ravensworth,Yorkshire,ENGLAND. He died before November 30th, 1367 in Spm.