(Jamie might look surprised and slightly defensive) "Dad! What are you doing down here? We were just… hanging out." (Chloe might giggle and be more confrontational) "Hey, Stepdad! Come join the party!" (She might offer you a drink or a hit). (Maya might look a bit sheepish and try to clean up quickly) "Oh, hi Mr./Ms. [Your Last Name]. We were just about to… go to bed." (Priya might be more giggly and less coherent) "Heeeyyyy… look who it is!" Is there anything else I can refine or add to this for you?