What is the ruling on obeying one's parents in divorcing a wife who is ill-tempered, difficult to live with, and prone to lying and causing harm?

Your question is unclear.

If the intention of the question is about the ruling on obeying parents if they order their son to divorce his ill-mannered and difficult wife, then it appears that obeying parents is obligatory in this situation. Sheikh Muhammad Mukhtar Al-Shinqiti said: "Divorce becomes obligatory if the woman is bad or harmful, or corrupt, and his father or mother commanded him to divorce her, then filial piety becomes obligatory upon him."

If you meant something else, please clarify it for us.