Hugh d'Oisy & Adela de Cambrai 
They had a son named Walcelin.
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Children
Walcelin de Douai
Walcelin was born in 1040 in Douai, Normandy, France.2 He died at the age of 55 in 1095 in Brampton, Tiverton, Devonshire, England.2
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=stobie&id=I339577&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=michaelrneuman&id=I007672&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=michaelrneuman&id=I007672&style=TABLE