I understand that your nephew is facing a difficult situation, and I'll do my best to provide guidance.
Firstly, it's essential to understand that lying or withholding information in court is a serious offense and can lead to severe consequences. If the girl has lied about her employment status and income, it can be proved using various methods like bank statements, tax returns, salary slips, etc. These documents can be obtained through legal procedures like discovery, which allows the parties to request relevant information from each other.
If the judge has passed a decision without considering the girl's actual income, your nephew can file an appeal and provide evidence of the girl's real income. However, it would be best to consult with a qualified lawyer in this matter as they can guide you on the correct legal course of action.
Moreover, it's important to note that pressuring or bribing a judge is illegal and can lead to severe consequences. If your nephew suspects any illegal activities, he should immediately report it to the appropriate authorities.
In conclusion, I strongly recommend that your nephew seeks the help of a qualified lawyer who can guide him through the legal process and protect his interests. It's essential to gather evidence to prove the girl's actual income and present it in court. Additionally, it's vital to handle the matter legally and ethically and not engage in any illegal activities.