*Nicholas "Plukiel" Seigneur d'Avesnes, Leuze et Conde
born about 1129 Oizy, Namur, Belgium
died about 1169

*Walter I d'Oisy Seigneur d'Avesnes et Leuze
born about 1105 Oizy, Namur, Belgium
died 1147

*Ada (Ida) of Mortagne
born about 1109 Oizy, Namur, Belgium

Thierry D'Avesnes

*Mathilda de la Roche
born about 1133 La Roche-en-Ardennes, Luxembourg

*Roger Seigneur de Conde born about 1141 died about 1200
*Jacques d'Avesnes born about 1155 Avesnes, Pas-De-Calais, France
died 7 September 1191 near Arsoef, Palestine
Ida d'Avesnes born about 1157 Avesnes, Pas-De-Calais, France
Fastre d'Avesnes born about 1159 Avesnes, Pas-De-Calais, France
Miss d'Avesnes born about 1161 Avesnes, Pas-De-Calais, France
Radulph d'Avesnes born about 1163 Avesnes, Pas-De-Calais, France

biographical and/or anecdotal:

notes or source:
The connection between Nicholas (the father) and Roger is speculative.
Because of the closeness of the dates there is the possibility they could have been brothers.
Beyond Roger de Conde enter at your own risk.