Not much is known about Jeremiah's father. He cared little for his son and was not interested in his son writing. After sending Devitt to St. Gall he did not even bother to reply to his sons letters. It's unknown if he was to busy with thing work related or he stopped caring at all about his son after his wife died.
Important dialogue Edit
Basically his father states that he is send to St. Gall and he to busy to be bothered with him at all. At St. Gall's, Devitt keeps enquiring about his father's letters. Father Ernest asks Devitt to stop enquiring about his father returning his letters, probably to spare Devitt the costs of false hope.