Fastre I Ida 
Fastre II Gossuin (daughter)
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| Fastre II Gossuin (daughter)
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Fastre I d'Oisy, chatelain de Lens
1040, Avesnes, Pas-de-Calais, Normandy France - June 8, 1091, Namur, Walloon Belgium
Ida d'Avesnes
abt 1045, Avesnes, Pas-de-Calais, Normandy France - abt 1098, Olsy-en-Cambresis, Hainaut France
Married: ?? - ??
Fastre II d'Oisy, chatelain de Tournai
abt 1080, Oizy, Walloon Belgium - August 5, 1111, Avesnes, Pas-de-Calais, Normandy France
Gossuin d'Oisy, seigneur d'Avesnes
abt 1084, Oizy, Walloon Belgium - 1127
(daughter) d'Oisy
?? - ??