Robert de Mortimer
Robert was born about 1169 in Woodham Mortimer, Essex, England.  He died after July 1216.

 Margaret de Say
Margaret was born about 1182 in Richard's Castle, Hampshire, England.  She died before 1243.

 Hugh de Mortimer
Hugh was born in 1219 in Richard's Castle, Hampshire, England.  He died at the age of 55 on November 18th, 1274.