The 138 subclbutt visa has a requirement for a MANDATORY AOS. This means that you must have an butturer and they will need to go through the AOS process via CentreLink. The butturer will be required to provide a bond in the form of a term deposit with a bank and will be financially responsible for any changes you make against CentreLink. Your brother could be your butturer, but it does not have to be a relative. Your brother is your sponsor, and in many cases the same person will also be the butturer. Note that the butturer needs to have a required level of income for the past 2 years to qualify. As the applicant for the visa you will be informed when the AOS is requested (usually at the same time the medicals and PCC are requested), and you will need to forward some information to your butturer (a letter from DIMIA).
As far as review rights go, I buttume you mean the right to appeal a visa denial to the MRT? Both the 138 and 139 subclbutt visas do have this right, which is different from the 136 which I don't think does. This is due to the fact that the 138 and 139 clbuttes are family sponsored. Other family sponsored clbuttes may have this right as well.
Cheers, Brian
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