The John Feist family is listed in book written by Fr. John Boser titled "A View of the Boser Kinship". It has the parents of John as Nicholas Feist and Katherina Boser. I can scan the applicable page if you would like.
I am looking for a Anna or Katharina Feist born about 1850 and married Friedrich Schroeder in the Crimea about 1870. She died 1879. Friedrich Schroeder was the brother of Michael Schroeder who settled in the Holy Rosary area. Michael Schroeder was married to Franziska Hermes who was a sister to Magdalena Hermes who was married to your John Feist.