I've always looked at Oldest's lying as just another manifestation of her personality disorder. It's fairly typical from what I've read and have been told by professionals. Maybe it's a separate disorder for her, I don't know -- guess it doesn't really matter since she won't get help anyway. She rarely admits to the truth, even when it's presented to her with proof: she just tells you that the proof is wrong.
The most bizarre lie she ever told was to her employer years ago: she called in and said she wouldn't be in because her sister had been hit by a car. Worked great until her stepmother happened to walk into the store a few hours later, and the clerk recognized her last name and asked how Youngest was. Her dad called our house in panic, Youngest answered the phone, and that one blew up in Oldest's face. Her answer? She didn't remember making the call, she was feeling so sick. Ha.
The most bizarre lie she ever told was to her employer years ago: she called in and said she wouldn't be in because her sister had been hit by a car. Worked great until her stepmother happened to walk into the store a few hours later, and the clerk recognized her last name and asked how Youngest was. Her dad called our house in panic, Youngest answered the phone, and that one blew up in Oldest's face. Her answer? She didn't remember making the call, she was feeling so sick. Ha.