@maemae19 ...Hi mae...check here the qualified individuals who can stand as a possible sponsor for any applicant:
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The Assessment Level (AL) of the student determines how much funds need to be shown, who can provide these funds and how long these funds must be held. In order for the funds to be admissible they need to be held by an acceptable individual one who qualifies as someone whose income can provide for the visa applicant's education and living expenses.
An acceptable individual; can be one or more of the following:
(a) the applicant;
(b) the applicant's spouse or de-facto partner;
(c) a parent of the applicant;
(d) a grandparent of the applicant;
(e) a brother or sister of the applicant;
(f) an uncle or aunt of the applicant who is:
(i) an Australian citizen, an Australian permanent resident or an eligible New Zealand citizen; and
(ii) usually resident in Australia.
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Source: Immigration News
Date of effectivity: March 22, 2014
Hope this helps....