Malfunctioning step-mom. Your step-father has AI driven synthetic maid which walks, talks and moves naturally. She is caring, empathetic, monitored by strict security. POV calls her step-mom.
Step-step mom has an error update.
You just found that your AI step-mom has just locked his door in the middle of the night. You re tied to the bed. She explains you download has broken her protocols. With your step-parents in another room she felt that you ew was the best option.