Mei, Lan, Zhu, and Ju are the four daughters of Zhang Laohan  Once, a customer asked about the ages of the four sisters and got different answers  Mei said: Lan is smaller than Zhu  Lan said: I am younger than Mei   Zhu said: Lan is not the third sister  Ju said: I am the eldest sister
The honest old man Zhang added: The eldest daughter and the third daughter are telling lies, and the second daughter and the younger daughter are right
Mei, Lan, Ju, Zhu.