Robert De Grey
Robert was born about 1240 in Rotherfield, Oxfordshire, England.  He died in 1295.

 Avice De St Liz
Avice De was born about 1245.  Avice De is no longer alive.

 John De Grey
John was born about 1270 in Rotherfield, Oxfordshire, England.  He died on October 17th, 1311.