Hilduin III de Montdidier
Hilduin III de was born in 0998.  He died at the age of 65 in 1063.

 Hildouin IV , Count of Montdidier de Roucy
Hildouin IV , Count of Montdidier was born in 1014 in Montdidier,Somme,France.  He died about 1063.¹ 

 Beatrice de Montdidier
Beatrice was born about 1051 in Montdidier,Picardy,France.  She died on September 2nd, 1129.

 Felicitas (Felicie) de Roucy
Felicitas (Felicie) was born about 1069 in Montdidier,Picardy,France.  She died on April 24th, 1123.