I feel like the Perrots were at the same Yuletide parties as the Delacroix and the Delacours, so they've probably known each other since they were little girls. Camille just hopes she doesn't know things!
And Lucie says her blood is even muddier this go around! So no discriminating, you two.
Oh! And if you do app one of the Monet twins, they'd be on the same Quidditch team as Betty. Yaaaaay.