can I apply under the remaining relative visa in Australia ?

Question

i have a sister living and working in Sdyney as a permanent resident

Answer 1

There are any number of web sites which will assist you in this.
Your first stop should of course be the official govt site, which is :
www.immi.gov.au

Immigration into Australia is strictly controlled, and works on a skills needed or compassionate grounds (which could include last surviving relative) basis
Its neither easy nor automatic, the days of the ten pound tourist are long gone.

Answer 2

Only if you are the last remaining relative from the same father and mother.