[@reiko] She spent a week in NYC for her audition and she's probably visit her brother at least once or twice a year depending on how much she saved up, so she could totally have met Richard during the summer. Jasper would sleep on the couch while Ava slept in his bedroom. But if she visited a short time during the summer, they could know each other more than "this girl is my roommate's sister" Assuming Richard spent time with her when she ventured out in the big city.