Photo: National Library of Australia.
Left to right: Monash and Anderson standing.
The ladies are Victoria Monash and Ellen Anderson.
I now think that the man seated is Anderson's brother Jack. For a while, I thought it might be his brother Henry, who was a doctor in the Royal Army Medical Corps (South Africa, Burma) and in 1903 held the rank of Captain.
The boy must be the Anderson's son, Stewart, born May 1893.
The girl on the left is Bertha Monash, born January 1892.
The girl on the right must be Frances Anderson, born November 1894.
The baby must be Alice Anderson, born June 1897.