Robert de Marmion de Grey
Robert de Marmion was born before 1359.  He died before November 30th, 1367.

 Lora de St. Quintin
Lora de was born before 1347.  She died after 1365.

 Elizabeth Marmion Grey
Elizabeth Marmion was born in Marmion, Tanfield, Yorkshire, England.  She died before December 14th, 1427 in Yorkshire, England.