The Ordinary Dark Ones in the Realist Novel for Young People

What does Josiane, the unpleasant, homophobic half-sister of the Morlevent children contribute to the story Oh, Boy!? What role do the racist adults in Maboul à zéro or the discriminatory teacher in La Vie, en gros shoulder? How and why do Maxime’s parents reject his HIV-positive uncle in Adieu Maxime?