My maternal grandmother was born in Australia-can I get an ancestral visa for Aus?

Question

I am a South African citizen. My maternal grandmother was born in Sydney Australia. Can I apply for an ancestral visa based on that?

Answer 1

A person born outside Australia on or after 26 January 1949 may be registered as an Australian citizens by descent provided

they had an Australian citizen parent at the time of birth; and

if the Australian parent is also an Australian citizen by descent, that parent had lived legally in Australia for a total of 2 years, or the person has no other nationality;

A person born outside Australia and New Guinea before 26 January 1949 may be registered as an Australian citizen provided:

http://en.wikipedia.org/wiki/Australian_...

what about your parents? what nationality do they hold?