The Delacour family always did their best to act polite and proper. Such behavioral guidelines were strictly enforced, both inside and outside of the household.
This was also true when it came to the approval of boyfriends for the two young dames, Fleur and Gabrielle. First and foremost, no manners, no approval. Though interestingly, Gabrielle was the first of the two to find a mate whom not only she truly loved, but was approved by both Maman and Papa: Harry Potter.
As one might have expected, it took some time though for Harry to be approved, but eventually, he was.