I am very excited to have acquired a check written on August 1, 1867 by Forstall & deLassus; not one, but TWO of Madame Lalaurie's sons-in-law. Placide Forstall married Madame Lalaurie's daughter from her first marriage, Maria "Borquita" Lopez y Angullo, and was the son-in-law to who Madame Lalaurie signed over her power-of-attorney when she and her husband fled Louisiana. Pierre Auguste deLassus married Jeanne Blanque, Madame Lalaurie's daughter from her second marriage to Jean Blanque, and he was the the stepson-in-law to whom Dr. Lalaurie signed over his power-of-attorney.
Madame Delphine Macarty Lalaure died in 1849 and Dr. Lalaurie in 1863 so this check (dated 1868) makes one wonder if Forstall and deLassus had other business together or if there was still some lingering business connected with either the estate of Madame or Dr. Lalaurie. It would take more research than I'm willing to devote in order to find out but I'm thrilled to have a paper connected directly to the Lalaurie family.