Sir Robert de Grey
Robert was born in Rotherfield Greys Castle, Henley-On-Thames, Oxfordshire, England.  He died before May 27th, 1295.

 Joan de Valognes
Joan was born about 1257 in Shabbington, Buckinghamshire, England.  She died in 1312.

 Thomas de Grey
Thomas was born in 1274 in Rotherfield Greys, Oxfordshire, England.

 Sir John de Grey I of Rotherfield
John was born in 1277 in Rotherfield Greys, Henley-On-Thames, Oxfordshire, England.  He died at the age of 34 on October 17th, 1311 in Wilton, Wiltshire, England .