Simon de Danmartin
Simon was born before 1200.  He died in 1239.

 Marie (Jeanne) Talvas of Ponthieu
Marie (Jeanne) Talvas of was born about 1196.  She died in 1251.

 Johanna de Danmartin of Ponthieu
Johanna de Danmartin of was born in 1216 in Dammartin, Seine-et-Marne,  France.  She died in Abbeville, France.

 Philippe de Danmartin
Philippe was born after 1216.