Helen is Grace's sister seen only in "Do You Know Who You Look Like?". She's in poor health condition and is cared for by Frank when Grace manipulates him. She tells Frank that her skin was burnt off by Grace when they competed for their father's love and that she's always wanted to have sex. As she and Frank have sex, Grace walks in on them and fights her sister, thinking she's trying to steal attention from her. During their fight, Grace angrily pounces on her sister, knocking them both into a nearby fireplace and their passing. She is voiced by Heather Lawless.