Preferably within 4 hours of Melbourne
That covers most of the state of Victoria
I don't know how many families would be camping in Victoria in the middle of winter.
There's always National Parks, while the more popular ones might get winter campers (brrrr)
there are more than enough less popular / out of the way ones.
Camping In Victoria's Parks Map (pdf)http://www.parkweb.vic.gov.au/resources05/05_1266.pdf
Parkweb page with National Parks and State Parks with Camping.http://www.parkweb.vic.gov.au/1process_ ... activity=5
Most State Forests allow camping, some have facilities some have nothing.
Slightly confusing site ... DSE State Forests Maps & Local Information page.
Click on region then click on Places To Visit for information about specific State Forests.http://www.dse.vic.gov.au/DSE/nrenfor.n ... 123D7?open