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The age of emancipation in Virginia is 18 years of age. Support may continue for any dependent child that is a full-time high school student and living in the home of the parent, until the child reaches age 19 or graduates from high school, whichever comes first. (Code of Virginia, 16.1-228) His mother is not required to continue paying support so this could stop at anytime by law.
As far as him having to emancipate by law he already is so he has no need to do anything other then function as a adult.
I wish you and your family the best,
I would go ahead and reschedule the appointment. The issue here is he is still in school and thus the school must follow the standards set forth of who enrolled the child. Since he is now 18 he has the right to sign himself out of school based on his own appointments but in the end, it is more hassle then it is worth to fight the school on this matter.