Boudewijn van Peteghem, châtelain de Tournai - HIs mother was Evrard's 2nd wife Gertrude de Montaigu

http://fmg.ac/Projects/MedLands/HAINAUT.htm#EverardIIRadulfTournaid...

2. EVERARD [III] Radoul (-[1189/30 Apr 1190]). ... m secondly as her second husband, GERTRUDE de Montaigu, widow of RAOUL de Nesle Châtelain de Bruges, daughter of LAMBERT Comte de Montaigu & his wife --- (-after 10 Sep 1185).

Everard [III] & his second wife had one child:

c) BAUDOUIN (before 1166-after 21 May 1208). The Chronicon Hanoniense names "Balduinum" as son of "Evrardum cognomina Radonem" and his second wife[2055]. Châtelain de Tournai. Seigneur de Mortagne.