Many thanks for your help, guys. It is definitely an Overland. I attach a picture of a 1916 Overland I downloaded from another website. My grandfather's car was a right-wheel drive model used in Australia. The two boys (my father and uncle) are dressed as Australian soldiers in the First World War (1914-1918 for Australians).
This car was owned by my grandfather. I think it is a 1925 Buick. it is an export model. Note the streering wheel on the right. I am sure there are members who could indentify it at a glance. The photgraph attached is a jpeg file.