Siegfried married Elstrude de Flandre 964. Elstrude (daughter of Arnoul de Flandre and Adèle de Vermandois) was born Abt 942; died 972. [Group Sheet]
Ardolphe married Mahaut de Boulogne 972. Mahaut (daughter of Arnoul II de Boulogne) was born Abt 965. [Group Sheet]
Raoul married Roselle de Saint-Pol Abt 1002. Roselle (daughter of Hugues de Boulogne) was born Abt 995. [Group Sheet]
Eustache married Suzanne de Gramines Abt 1030. Suzanne (daughter of Siger de Gramines) was born Abt 1015. [Group Sheet]