From your description, it appears that it was a stipulation betwen the parties and not the Family Court judge's order. Whether it can be modified depends on factors including whether the stipulation was reduced to an order; whether it was a temporary or final order; and when it was issued. You can cretainly raise the issue before the Support Magistrate and give your reasons as to why the father should be responsible for 100% of the educational expenses. Is there a large discrepancy in income between you and the father? What are the other economic factors involved?
A Support Magistrate cannot "overrule" a judge's order, but they can issue a new order that modifies the terms of an existing order. It would be best to consult with a local attorney to review the specific facts and circumstances in detail before you file another petition with the court. You can find someone in your area by searching among the attorney profiles here on AVVO. Good luck!
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