Lefrançois family

Lefrancois was the surname of an old pure-blood wizarding family. The family originated in France. They were related to a few french Pure-Blodd families including the Rosier Family,

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Given these relations, as well as the participation of one Lefrancois in the Global Wizarding War as fighting against Grindelwald and later two Lefrancois in the First Wizarding War were part of a movement against Lord Voldemord, it is likely that the Lefrancois did not place great importance on their pure-blood heritage. They most likely felt alright with Muggle-Borns a.o Half-Bloods.