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You are not required to continue to provide support for an emancipated child. One of the stipulations to emancipation is that the child is willing/able to provide for him or her self. Even without emancipation, the age of majority in New York is 21. If your wife decided to take you back to court to make you pay, I cannot imagine a court ruling that you pay more tuition for an 22 year old adult child that you have already paid tuition for four years.
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