http://en.wikipedia.org/wiki/Hugh_II_of_Ponthieu

Hugh II of Ponthieu was count of Ponthieu and lord of Abbeville, the son of Enguerrand I of Ponthieu. Evidently Hugh II was the half brother of Guy, who became the bishop of Amiens; Fulk, who became the abbot of Forest l'Abbaye; and Robert. However, it is possible that both Robert and Hugh II were the sons of Enguerrand's first wife, and Guy and Fulk the sons of a later wife that Enguerrand I married when he was in his forties.
Hugh II was married to Bertha of Aumale, Countess of Aumale. They had at least five children: Enguerrand II who succeeded Hugh II as Count of Ponthieu; Robert; Hugh .