Casey interrupted Meg and Sara fighting about Meg's living situation with Ben, Benjy, Maria and Tess. After Meg left, Sara told Casey that Meg had been snooping in Tess's room and blamed her for it. When Casey berated Sara for interfering in Meg's life, Sara asked why it was acceptable for him to interfere, but not for her. When he didn't see where she was coming from, she tried to explain, but he didn't see any similarity in their behavior. He asked if helping Meg was worth ruining what they had, and Sara said that she didn't want to mess up what they had together. (thetvdb.com)