The Staircase: A Complete Breakdown of the Peterson Family

Martha (left) is Michael's other adopted daughter and Margaret's biological sister. In the documentary, she indicates that she is firmly on her adoptive father's side. She also said that she experienced deep anxiety from the trial. "I used to suffer a lot from really bad nightmares; I used to have really bad panic attacks in public spaces because of being in the trial," she admitted. As of 2018, she lives in Colorado.