An investigative journalist has delved into the twisted background of my mother's family:
Yvonne was my mother's aunt whom I knew through various anecdotes (including most famously that my mother was so scared by Yvonne's son Edgar's forcing her to watch Abbott and Costello Meet the Mummy that if she didn't leave the theatre she would "jump out the window" - I never understood what movie theatres had windows but that was the story). Edgar, my mom used to say, had strong sadistic tendencies. Seems like things never changed. I wish my mom was alive to learn all this information. She was too young and history moved too quickly during the war and after, that she didn't get a chance to reason it all out.