John DE GREY & Avice MARMION 
They had a son named Robert.
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Personal Details
John DE GREY
John DE was born on October 9th, 1300 in Rothersfield, Yorkshire, England. He died at the age of 58 on September 1st, 1359.
Avice MARMION
Avice was born about 1309 in CAnfield, Yorkshire, England. She died after March 20th, 1378.
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Children
Robert GREY
Robert was born about 1345 in Ravensworth, Yorkshire, Enland. He died before November 30th, 1367.