Once the person is 18 they are an adult and should have to stand on their own. Without more, there is no way to determine why the grandparents' income was asked for.
If the 18-year-old is still in school then presumably he/she is still taken care by the grandparents which is why they would ask for the income. Court-appointed attorney aren't necessarily free lawyers. You may be ordered to pay a reduced amount for the attorney services by the court.
Public defenders are appointed to defendants that do not have sufficient means to pay for a private lawyer. If a defendant qualifies for the services of the public defenders is an income driven question. The court will review all sources of income (including your grandparents) and support that you receive to determine if you qualify or not for appointment of counsel.
With a public defender the court will ask the Defendant, parent, or legal guardian to pay the legal fees. Usually these run in the hundreds of dollars. However, if the Defendant can show that he does not have any money, the court may waive the payment requirement.
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