<p>Since you are no longer a minor, it is unlikely that any court would issue guardianship orders; they generally pertain to minors.</p>
<p>In the absence of a legal order placing you with your grandmother, however, it is not unreasonable for your school to expect you to submit financial information from your most recent legal guardian - and that would be your mother. Otherwise, what’s to prevent the child of affluent parents from pretending to move in with an impoverished relative just so as to avoid having to pay for college?</p>
<p>I would guess (and this is just a guess) that, without a court order placing you with your grandmother, you would be held to the same standard as a student claiming independence. If you can’t do that, then you’d need to provide your parent’s information or be deemed ineligible for federal aid.</p>