Robert de Ferrers
Robert was born in 1242 in Derby, Lincolnshire, England.  He died at the age of 37 in 1279.

 Mary De Lusignan
Mary was born about 1242.  Mary is no longer alive.

 Elizabeth de Ferrers
Elizabeth was born about 1258.

 Alianore De Ferrers
Alianore was born about 1264.