Simon de Montfort
Simon was born about 1025 in Montfort Amaury, Ile De France, France.  He died in 1087 in Epernon, Normandy, France.

 Isabel de Broyes
Isabel was born about 1026 in Broyes, Marne, France.  Isabel is no longer alive.

 Isabelle de Montfort
Isabelle was born about 1046 in Montfort, Normandy.

 Amaury "The Strong" de Montfort
Amaury "The Strong" was born about 1056.