Hi Neil. I have no idea if this is the same person. It is very frustrating
trying to do the research. It is known that Ronald came from Chinese but it is also thought that he was aboriginal decent too? Unsure of where to go from here. 
Some sound advice has come from Cando in regard to where to go from this point. The certificate may contain clues which you will probably not find elsewhere.
HEATHER LILLIAN MAKIN lived at 49 Kenny Street Wollongong in 1949.
There are three others of the surname at the address. There are other groupings of people with the surname in the area.
I do not think she is relevant at the moment to your search.
Sue