When a parent wishes to come or migrate to Australia it is necessary to obtain a Visa in order to do so, and it is called a parent visa. Of course that parent needs to have either a stepchild, adopted child, or natural child be either a settled eligible or settled permanent inhabitant of either Australia or New Zealand. Further the applicants need to have at least ½ of their children permanently living in Australia, and have more of their children living in Australia than in other countries.
What this parent Visa will carry along with it is that the actual applicant, plus their accompanying spouse and/or other dependent family member(s) will then be able to become permanent residents to Australia, study and work in Australia, be able to receive medical and pharmaceutical benefits, receive social security payments, make application for Australian citizenship. Further, they will be able to sponsor other people who wish to become permanent residents of Australia.
You Can Seearch at: https://australianimmigrationagency.com/visa/family-visa/aged-parent-visa/