If I have this correctly, Casey has always lived with her parents. Except that in June she took off for awhile with Caylee. While gone, Casey called everyday so they knew she was OK. Grandma would ask to talk to Caylee and got excuses, like she’s napping, she’s with the sitter, etc.
Recently Casey went back home, without Caylee. That’s when Grandma started to get really suspicious. She and her husband initially told the police that they feared something had happened to Caylee but now Grandma has gone into some kind of denial.
These criminal masterminds have finally realized that all the calls from the jail are recorded. Their demeanor is completely different from earlier calls. Instead of sniping at each other, Lee is acting like he's Monk asking all these detective-like questions, because they've finally decided to look for Caylee! Now Casey says that she talked to Caylee on the phone the day her mom called 911. She cannot keep the disdain for her mother's actions out of her voice.