Hello Valerie. I am your aunt, Katherine Helen Proch's (this is the way she said it was spelled) daughter, your mother's youngest half-sister. My mother's father's name was Michael, but can't remember what her mother's name was. I believe you are correct about her siblings, although I only ever met her sister Anna many years ago when I was little. Her parents were from Poland. She told me when she was around 13, her mother died and her father re-married. I stumbled upon your posts while Googling my mother's name and was surprised to see someone I am actually related to.