There seem to be several siblings :
Alice 1873 Furlough, Victoria
Isabella 1874 Stewart Mill, Vic
Ellen 1876 St Arnaud, Vic
William James Elton 1878 Avon, Vic
John Holmes Short 1880 Conald, Vic
Francis Venning 1882 Swan, Vic
Edith Mary 1884 Swan , Vic
Philip MacMillan 1885 Cogh, Vic
Parents for all given as William John Elton Short and Ellen Mcmillan Mckay
The experts on the Australia board may be able to find more information than these basic index details.