<p>From <a href=“http://studentaid.ed.gov/students/publications/completing_fafsa/2007_2008/ques5.html[/url]”>http://studentaid.ed.gov/students/publications/completing_fafsa/2007_2008/ques5.html</a></p>
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<p>Based on the above it looks as if even if your grandparents were your legal guardians you could not use their information for FAFSA. Whether you are claimed as a dependant on your mothers income tax makes no difference on FAFSA (for instance we do not claim our son on our taxes because he has a job and earns over the threshold for us to claim him on tax but we are able to claim him on FAFSA because he is considered a dependant for FAFSA purposes i.e. can answer no to all the dependancy questions.) I would agree with Chedva that you should contact your Financial Aid officer at school and ask if there is anything to be done.</p>