If you currently hold a Skilled – Graduate (Temporary) visa (subclass 485), you may add the following secondary applicants after your visa has been granted:
your spouse
your interdependent partner
a dependent child of you, your spouse or your interdependent partner
a dependent relative of you or your spouse.
They must apply using the paper Form 1276.
There is currently no online facility for adding family members after a visa has been granted.
You will need to provide evidence of your relationship to your family members. ”