Originally Posted by double_u
In the first message, the mother tells the babysitter they are delayed because the father got attacked by a crazy guy, which suggest that a walker got him during the early days of the outbreak.
In the third message, you hear heavy automatic gunfire in background as the mother desperately tells Clem to call the police for help. The gunfire in the background suggests that where her mother was, the walkers were about to overrun the military or police guarding it (similar to the WABE "sign off").
And you could hear very distinct walker groans as she was telling Clem that they love her. The call was obviously an attempt to say goodbye because they assumed they weren't going to make it.
Yeah, I wish I could have told her about it at some point, rather than just saying "they're dead. Move on." like an ass. Give her proof and she might have actually listened and knew the stranger was up to something.