Adeline de Montfort - Very different parents seen

Any insight?

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Biography

https://www.wikitree.com/wiki/Montfort-22

"The said Turghetil was Lord of Turquevile, Turqueray, &c. and joint guardian and governor, with his said elder brother, Touroude, to William Duke of Normandy, as before taken notice of; and at last basely murdered for his attachment to that prince. He married Adeline de Montfort, sister of Toustain Lord of Montfort sur Risle ; and by her had Anchitel, his heir; Walter de Turqueville; and Lesseiine, the wife of William Earl of Eu, Exmes, and Montreuil." [1]

Sources

• 1. Collins's peerage of England; genealogical, biographical, and historical, pg 430 [1]

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https://homepages.rpi.edu/~holmes/Hobbies/Genealogy2/ps14/ps14_363.htm

Name: Thursdale de Bastembourg
Birth: 936, Montfort-Sur-Risle, Normandy, France
Death: 1023
Father: Anslec de Bastembourg Seigneur De Briquebec
Mother: Helloe de Beulac
Spouses ?

Children

1. [[Adeline de Montfort Adeline de Montfort] Adeline of Montfort] married Turchetil Lord of Turqueville

(This loosely but not entirely correlates to Turstan de Bastembourg)