The historian David Bates argues that the relationship to the Aincourt family is likely, based on fact that the family held lands near Fécamp. Bates is less inclined to believe in any relationship to either William I or William II, but feels it isn't possible to rule it out either, due to the complex nature of the early history of the Norman ducal family.
Historian David Bates believes there's a strong possibility that the Aincourt family is related to the Aincourt family, based on their land holdings near Fécamp. However, he's less certain about any connection to William I or William II, acknowledging that it's difficult to definitively confirm or deny due to the complexities of early Norman ducal history.