The Real Mrs. De Florian?

Henri was with his mother when she gave up her soul in 1939. The experts concluded that from his signature that had been found on her death certificate. Henri occupied the apartment with her daughter Solange Beaugiron after the demise of his mother. It is believed that his daughter is Mrs. De Florian. Solange continued to reside in the apartment until World War started. It is popularly believed that the lady was a  playwriter who was working with a pseudonym “Solange Beldo.”