Commentary
Charles Cawley says she is the daughter of Senfrie, Avelina's sister - "According to Europäische Stammtafeln, Josceline's husband was Hugues de Montgommery and her parents Osbern de Bolbec and his wife Wevie, but this is presumably based on Robert de Torigny, continuation of William of Jumièges, the unreliability of this part of whose chronicle is discussed in the Complete Peerage"
Family
ClaimDetailEvidence
MotherSainsfrida (e961-) [S905]
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SpouseRoger de Montgomery I, Seigneur of Montgomery (e992-<1048) 
Child +Roger de Montgomery, Earl of Shrewsbury (e1025-1094) [S775:XI.682] [S905]
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Attributes
ClaimDetailEvidence
GenderFemale
NameJosceline [S775:XI.682] [S905]
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MotherSainsfrida (e961-) [S905]
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AuntGunnor, Duchess of Normandy (~950-1031) [S775:XI.682]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 993 (985-1001)
 
Sources
IndexTitle
[S775] George Cokayne, "Complete Peerage" (https://dcms.lds.org/delivery/DeliveryManagerServlet?dps_pid=IE83409).
[S905] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Normandy: Alencon, Evereux, Meulan, Perche)" (2006-7 (v1.1 Updated 02 March 2007)) (https://fmg.ac/Projects/MedLands/NORMANDY NOBILITY.htm).