chunk: The tension between the sisters comes to a head later that night at their father's house, when Kym comes home. Rachel reveals she has never forgiven Kym for their brother's death, and suggests that Kym's rehab has been a hoax since she has been lying about the cause of her problems. Kym finally admits responsibility for Ethan's death and reveals that she had been relapsing in order to cope. She gets into her father's car and leaves. Kym heads to the home of their mother Abby (Debra Winger), hoping to find solace with her. However, a fight breaks out between them, when Kym asks Abby why she left Ethan in her care on the night of his death despite knowing that she was often on drugs, suggesting that Ethan would have been better off in Rachel's care. Abby tells Kym she left Ethan with her because she was good to him and that she thinks Rachel is a hypocrite for her accusations.