Strapped for cash, Marigny later sold his lots not only to white Creoles but also to free black Creoles, known as gens de couleur libre. Marigny was also related to one of the most prominent femme de couleur libre (free women of color), his half-sister Eulalie Mandeville Macarty, who was the illegitimate, but well loved daughter of Pierre Enguerrand Philippe De Marigny de Mandeville and Marie Jeanne, who was an enslaved woman from the Marigny household. Eulalie was given her freedom and brought up by her paternal grandparents, who left her well provided. Bernard de Marigny, as well as other Mandeville de Marigny family members, even testified on Eulalie de Mandeville's behalf following her husband's death, when her in-laws sued Eulalie de Mandeville for her estate. They claimed that legally a femme de couleur libre, such as herself, could not inherit the amount of money she possessed from her late-husband (or life partner, as interracial marriage was illegal). Eulalie countered by arguing that all the money she possessed she and her husband earned as equals and that the majority of their wealth came from her business endeavour from before their marriage. Bernard de Marigny testified in favour of his half-sister and helped her hold on to her wealth, not once but twice, as her late husband's family sued Eulalie de Mandeville again after being dissatisfied with the results of the first trial.