You are so right about the Kassner's being a mystery. No one wants to talk about them or for that matter the Potter's. Everything seems to be negative, except, my grandmother, Keziah Emmaline Martin Potter Meeks, who said she remembers that she was a sweet lady.
I really don't have anything on the Kassner's going back only forward with the Potter's. I would love to see a picture of her. I will e-mail you separately with that information.