Commentary
Weis shows Eustache de Champagne's father as Eustatce IV. Charles Cawley only shows one wife for Eustatce IV, Constance de France, the daughter of Louis IV, King of France, therefore it stands to reason that she is Eustache de Champagne's mother, although Weis does not directly state this, and Charles Cawley doesn't show the couple's children.
Family
ClaimDetailEvidence
FatherEustace IV, Count of Boulogne (~1120-1153) [S756]
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MotherConstance de France (~1128-) [S756]
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Spouse 2ndAnselme de Saint-Pol Comte de Saint-Pol (e1129-) 
Child +Béatrix de Saint-Pol (e1162-) [S756] [S921]
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Attributes
ClaimDetailEvidence
GenderFemale
NameEustache de Champagne [S756]
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NameEustachie de Champagne [S756]
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NameEustachie [S921]
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FatherEustace IV, Count of Boulogne (~1120-1153) [S756]
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MotherConstance de France (~1128-) [S756]
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Marriage 1st [S756] [S921]
Geoffrey de Mandeville, Earl of Essex
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1146 (1146-1149)
 
Deathabt 1164 [S921]
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S921] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Northern France: Artois, Boulogne)" (2006-7 (v1.2 Updated 21 January 2007)) (https://fmg.ac/Projects/MedLands/NORTHERN FRANCE.htm).
Kinship Lines for Eustache de Champagne
Spouse/PartnerDegreeRelationshipMRCA
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)93rd Cousin 1x removedRobert II, Duke of Normandy (e1001-1035)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)125th CousinArnulf, Count of Holland (e950-993)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)125th CousinLuitgard de Luxembourg (e951-)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)135th Cousin 1x removedHugh Capet, King of France (~941-996)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)135th Cousin 1x removedAdelaide (~945-~1004)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)146th CousinRagenold Comte de Roucy (e926-)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)146th CousinReginar III Comte de Hainaut (~920-973)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)146th CousinAlberade of Lorraine (~930-)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)146th CousinAdela (e921-961)
Anselme de Saint-Pol Comte de Saint-Pol (e1129-)156th Cousin 1x removedGiselbert, Duke of Lorraine (~885-939)