Pros- Melbourne has been rated as the safest city and most liveable city in the world 4-5 times in a row. Indian population is the highest there. There is social security once you rcve your citizenship. Medical, etc is well covered. There is no corruption. English language is spoken there. Right hand drive. Indian food easily available. Good education. extremely clean air to breath. Extremely sports oriented city for kids. Brilliant public transport - you save money. Easy Access to UK. Aussie passport easy to move for kids eventually. Aussies are extremely accepting of single parents.
Cons - you MAY face racism but only 2/15 times- it is only fair as you being second citizen are overpowering their population - but otherwise Aussies are extremely accepting &friendly . (So one needs to be friendly). Too many Indians may not be able to let you enjoy the Aussie culture. The industries in Australia are not as high paying as in India. Aussie degrees are not as celebrated in India as American are- if you intend to return. The job market in Australia is not as challenging & growth oriented as India.