Madame Florbelle died when Justine was young. She is mentioned in various notes in the Cabinet of Perturbation. A hidden note in the Crypt states "You see, his wife had died while giving birth to his son." This implies that Justine could have, or did have, a brother; or that Justine is a transgender woman.[Speculation]
Monsieur Florbelle's favourite of her poems was the following: Fair to fare on white foamed waves, / little feather on the rise, / my steady hand, it carefully saves, / a quill most cherished by the wise.