<blockquote rel="seekingforhelp">good day , what if your sponsor is a retired business man? but have funds and assets, is it ok that he will be a sponsor? and one question i have a sister in the states shes a citizen and has own homecare with her husband but their banks are under the name of his husband, what proof docs are needed? thanks! @danyan2001us</blockquote>check this guide for those who can be qualified sponsors:
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.
source: IMMIGRATION NEWS PTY LTD (ACN:165 846 980) | Suite 1 Level 1 | 36 Carrington Street | Sydney | NSW | 2000 | Australia
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hope this helps.....