My father was Norbert Schiestel (Stan's older brother)and they had a sister Marie. They grew up in Provost and the Hall family were neighbors. Stan married late in life and resided in Peace River Alberta. He was a forest ranger in the summer as well as a bar tender in the winter months
The only Schiestel relatives living would be your cousins.
My Mother told me that Stan was quite close with one of the Hall girls but did not remember her name.
Wish you all the best on your journey to finding out the truth about your birth father - if it was Stan, I must tell you that he was quite a jokester. I only met him a few times since we live in Ontario.