A freeze frame of the articles that Dr. Massey looks up about Sister Josepha online reveal the following things about her: 1.) Her younger sister's name was Denise. 2.) They were abandoned as infants, 3.) She and her sister grew up at an orphanage in New South Wales, called "The Lord's House". 4.) Sister Josepha got her Bachelor's Degree at Kings Theological Seminary in Ottawa, Ontario, and graduated with valedictory honors, 5.) She went on to attend the Oxford School of Advanced Religions Studies at Oxford College, 6.) Her sister Denise joined the following of a self-proclaimed messiah, and committed suicide along with the rest of the cult.
Again in reference to the articles Dr. Massey looked up online, Sister Josepha is referred to as Isabela Josepha Montafiore.
Michael Massee, who plays Isaiah Haden, previously played a similar villain-of-the-week in The Field Where I Died (1996).