John IV Knyvett & Alice Grey 
They had a son named Edmund.
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Personal Details
John IV Knyvett
John IV was born about 1422 in Buckingham Castle, Norfolk, England. He died in 1490 in Alternate YOD given..
Alice Grey
Alice was born about 1428 in Buckingham Castle, Norfolk, England. She died on April 4th, 1474 in Buckingham. Norfolk, England.
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Children
Edmund Knyvett
Edmund was born about 1460 in Buckenham Castle, Norfolk, England. He died in 1528 in Battle at sea.