Count Robert III De Dreux
Robert III is no longer alive.

 Leonore De Saint Valerie
Leonore was born in 1192.  She died at the age of 58 on November 15th, 1250.

 Yolande De Dreux
Yolande was born in 1212.  She died at the age of 36 in 1248.

 Robert IV De Dreux
Robert IV was born in 1217.  He died at the age of 49 in 1266.

 John De Dreux